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30 Ways To Sink a Boat { …and 29 to prevent it }

• By Daniel W. Long
• Updated: September 20, 2017

Boating Writers International 11th Annual Writing Contest – Daniel W. Long’s “30 Ways to Sink A Boat” won 1st place in the Boat/Engine Care Maintenance Category.

Remember the time you were running through the bay and heard a thump from below? Wasn’t that fun? No? Did it stir up that dreaded boating moment-the fear of sinking? No one likes to imagine such a thing happening. Yet every year thousands of us unwittingly experience that shiver of fright-and hundreds of us take it a step further by actually sinking.

• Billions of dollars worth of fiberglass sits on the ocean floor, mostly because it’s so easy to stop a boat from floating. You don’t even have to meet and greet a rock to get a one-way ticket down. In fact, you don’t have to do anything. Just let your boat sit awhile, and eventually it will find the bottom. According to BoatUS, the largest insurer of pleasureboats in the country, for every boat that sinks at sea, four go down in their slips.

30 Ways To Sink a Boat

• To find out why, we asked around the docks, checked insurance records, and talked to boatyard owners. Here are the top 30 preventable disasters. Not interested? Okay. But know that the cost of repairing a boat that’s done an underwater disappearing act is usually 40 percent of its total value. Now that we have your wallet’s attention, read on.

1. Stern Drive Bellows

What Happened: The rubber dried and cracked. Water seeped past the gimbal bearing and poured into the boat because the bottom of the gearcase cutout was well below the waterline.

What You Should Have Done: Store your stern drive in the down position when out of the water to avoid the bends and creases that stress rubber. Inspect the bellows two or three times a year and replace it annually.

2. Scuppers in the Fall

What Happened: The scuppers got clogged with leaves. Although this won’t seal the drains, it can greatly slow the release of water. In a heavy rain the cockpit can fill enough to weigh down the boat so it floods or accumulates enough water to reach non-waterproof openings in the deck and fill the bilge.

What You Should Have Done: Keep the cockpit covered, or have wide-mesh external screens made to protect the scuppers.

3. Scuppers in the Winter

What Happened: White stuff fell and ice built up around the scuppers, filling them in. Since this occurs under the snow, you can’t see it. The good news is that once the boat sinks, the ice will melt.

What You Should Have Done: Haul out for the winter, or have a waterproof, reinforced cover that can take the weight of accumulated snow. Don’t treat your boat like your mother-in-law: Visit it often.

4. Scuppers Anytime

What Happened: A piece of plumbing corroded, cracked, or just gave up. The weakest link is the hose that can crack, most often around the stress points created by the clamps.

What You Should Have Done: While the boat is on land, check the hoses by flexing them back and forth. If there are any cracks, replace the hoses.

5. Hose Clamp Failed

What Happened: A hose attached to a seacock below the waterline, or a through-hull just above it, came off its fitting because the hose clamps gave way.

What You Should Have Done: Secure each hose with two clamps where it passes over the fitting’s nipple. Check that the clamps are all stainless steel (a magnet won’t attract stainless). Often, the tightening gear and its case are mild steel, which rusts away.

6. Trapped Under a Dock

What Happened: You tied up the boat at low tide. The wind pushed part of the boat under the dock, the tide came up, and the boat became trapped beneath the dock, then sank.

What You Should Have Done: This can happen when the pilings supporting the dock are too far apart to keep the boat parallel to the dock and out from under it. No matter how many docklines you rig, this will be a problem. If you can’t dock somewhere else, set anchors out from the bow and stern so the boat won’t swing.

7. Tied Down, Tide Up

What Happened: At low tide, your bow and stern lines were tight. When the tide came up, the lines stayed that way-firmly holding the boat down as the water rose.

What You Should Have Done: Long spring lines attached at acute angles to the boat adjust as the boat rises and falls. Bow and stern lines may have to be tended as the tide goes through its cycle.

8. Stuffing Box

What Happened: The packing gland surrounding the propshaft loosened. Or perhaps it rotted away as it hadn’t been replaced for many seasons.

What You Should Have Done: Dripless shaft seals that require minimal maintenance are used by 90 percent of today’s boatbuilders. But many boaters still use old-fashioned stuffing boxes on the rudder shafts. Check stuffing boxes often, and beware.

9. Damage From Dock

What Happened: The wind started to blow, pounding the boat against the dock until a hole appeared.

What You Should Have Done: Tie up on the downwind side of the dock so the wind holds you away from the structure. Fenders would help. Use the round-ball type when up against a flat surface such as a concrete seawall. Use fender boards, a heavy board suspended between two fenders, when you’re against pilings.

10. Dockside Water Pressure

What Happened: An internal freshwater hose burst from the pressure of dockside municipal water.

What You Should Have Done: Shut off the water at the dock when you leave the boat.

11. Freshwater Flooding

What Happened: A fitting fails in the freshwater system. Thinking a tap has been opened, the pump senses a reduction in hose pressure and turns on the supply water-bad news if you’re hooked up to dockside water, which will keep pumping into the bilge.

What You Should Have Done: Never leave the boat without shutting off the water at the dock. This way, if a fitting or hose fails, you’ll pump only the water in your tank into the bilge. Better yet, disconnect the hose from your boat. Any moron walking down the dock could turn on the hose if it’s connected.

12. Generator Cooling Intake

What Happened: The hose cracked, water flooded, boat sank. I hope you’re picking up a pattern here about hoses.

What You Should Have Done: Use series 135 heavy-duty water hose-no exceptions. It resists chafe, is reinforced to prevent collapsing, and has a working pressure of up to 200 psi. Wiggle the hose where it meets fittings to look for cracks. Rub a damp cloth along it. If there are black marks on the rag, the hose is deteriorating.

13. Head Intake

What Happened: An unprotected head-intake hose running through the engine room bulkhead chafed, then failed.

What You Should Have Done: Do your hoses make as few bends and turns as possible? They should be secured tightly and padded where appropriate.

14. Head Intake II

What Happened: The water-fill hose connecting the outside of the hull to the head crapped out. The head, being below the waterline, filled and so did the boat.

What You Should Have Done: Besides maintaining the hoses and clamps, make sure the boatbuilder has left easy access to the inlet’s seacock. Make it a policy that when you leave the boat, you shut all the seacocks. Then, if a hose fails, it’s no big deal.

15. Head Discharge

What Happened: The one-way joker valve on the head’s discharge got something in it. You were smart enough to run the discharge hose above the waterline to keep water out but not smart enough to remember how a siphon works. Trying to siphon the full contents of the Atlantic Ocean, your boat soon sinks.

What You Should Have Done: To prevent a reverse flow, when you run any hose above the waterline, remember to install a vented loop fitting at the top of the loop. This lets air in to prevent a siphon. Use fittings that let you disassemble the valve each season to make sure it’s clear and working.

16. Check-Valve Backflow

What Happened: Since the through-hull is mounted so low to the waterline, a clever mechanic put a one-way check valve on your bilge pump’s exhaust hose to keep the sea out. Too bad it didn’t.

What You Should Have Done: Check valves are unreliable and can get stuck open. Route the pump’s exhaust hose as high as possible to a through-hull near the rubrail. If it must go to a low outlet, run the hose up inside the boat as high as possible, install an anti-siphon valve at the top of the loop, and run it to a seacock that you can close.

17. Ice in Sea Strainer

What Happened: When it was time to winterize, you put antifreeze everywhere except in the strainer at the raw-water intake. Then you left the boat with the seacocks open. The water in the strainer froze, expanded, and cracked the strainer. Water came in and the boat went down.

What You Should Have Done: Close the seacock and open the strainer’s drain plug to empty it of water. Then fill the hose and strainer with anti-freeze, because you never get all the water out and it’s better to be safe.

18. Plastic Through-Hulls I

What Happened: The cheap ones that came with the boat got brittle from ultraviolet light and gave way from the weight of the hose. Or maybe the hose barb cracked when you overtightened the hose clamps.

What You Should Have Done: We prefer stainless-steel or bronze fittings below the waterline.

19. Plastic Through-Hulls II

What Happened: The mechanic was in the bilge repairing the engine. While trying to get better leverage to force a rusted bolt free, he wedged his foot against a through-hull. He pushed and it cracked.

What You Should Have Done: Stick with stainless steel or bronze below the waterline. And use a better mechanic.

20. Transom-Mount Transducers

What Happened: You were smart to use bolts instead of screws to mount the transducer to the transom. But over the years the transducer has gotten nudged, hit, and smacked so often that the bedding compound loosened and enlarged the boltholes enough for water to seep in.

What You Should Have Done: Caulking and bedding compounds don’t last forever. Check every year and rebed every four years.

21. Through-Hull Transducers

What Happened: When hauling, the straps from the sling put pressure on the transducer, which disturbed the bedding and widened the hole.

What You Should Have Done: Properly installed transducers have large backing plates to distribute the stress of an impact. This one didn’t. Or you can mount the transducer within the hull so there are no exposed parts.

22. Corrosion

What Happened: Over the years, the dissimilar metals below the waterline have been eating each other-giving them an internal structure that’s similar to Swiss cheese. Eventually, a slight nudge caused one to fail.

What You Should Have Done: Again, we prefer that stainless steel or bronze be used below the waterline. But no matter what, all metals must be protected. If your bronze seacock is turning pink, it’s falling apart. All underwater fittings should be bonded to each other with a number 10-gauge green wire, and sacrificial zincs should be used. Check annually.

23. Speedometer Plug

What Happened: Good move pulling the Pitot tube for a cleaning. Too bad you forgot to plug the hole.

What You Should Have Done: Vitamin E supposedly helps the memory. Even with a plug, you can get a leak. Rubber O-rings can deform or come loose from their tracks. Put some grease on the rings to ensure long life and a good seal.

24. Stern Drive Mounting Bolt

What Happened: The holes on the engine-mounting bracket below the waterline leaked due to weeping. The stainless-steel bolts inside the transom corroded due to sitting in stagnant water. This is called crevice corrosion.

What You Should Have Done: Check the drive bolts often. Double-check the seal.

25. Hose Slips Off Seacock Nipple

What Happened: After a day of wave bashing, the shakes and vibrations worked a hose off an open seacock.

What You Should Have Done: If there’s room to put two hose clamps on each fitting, do it. Have the excess ring material exit in a different direction on each.

26. Rubrails

What Happened: From too many bangs against pilings, the screws, bolts, rivets, or adhesive that holds the rubrail in place has come loose. Plow into too many head seas or sit through a rainstorm and water will get below.

What You Should Have Done: At the end of each season, walk around the boat blasting the hull-to-deck joint with a hose. Have someone inside to watch for leaks.

27. Muffler Rot

What Happened: Water sat in a low point and rotted the muffler. Waves at the dock came in the transom exhaust ports and went directly into the boat.

What You Should Have Done: Feel under the mufflers or risers for moisture. They will ooze dampness months before giving way.

28. Frozen Muffler

What Happened: The drain plug on the bottom of the muffler or riser was removed but not replaced. Or you didn’t drain them and the ice did its worst.

What You Should Have Done: Drain the water, but don’t unscrew the plug and then go for drinks while it drains. You’ll forget to put it back in.

29. Drain Plug

What Happened: You forgot to put in the transom drain plug when launching. Join the club. You’re an idiot like the rest of us.

What You Should Have Done: Don’t be an idiot-install a high-water alarm.

30. Hit By Another Boat

What Happened: The guy in the slip next to you hit your bow while tying to a dock. This forced the bolted-on swim platform on your boat to bang the bulkhead and loosen the bolts, which started to weep enough so that by the next morning all you saw was the VHF radio antenna.

What You Should Have Done: Do a Jackie Chan on the clown who smacked your boat. Then string him up by his nose hairs. There are some sinkings that just can’t be prevented.

• More: Boating Safety , How-To , Preventative Care

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Luxury yacht sinks after fire; explosions heard on video

LOS ANGELES ( KABC ) — A high-end yacht docked at Marina del Rey sank after catching on fire Wednesday night.

The fire in Basin A was first reported around 8:30 p.m., according to the Los Angeles County Fire Department. Firefighters responded and poured water on the 100-foot vessel from the dock at the end of Bora Bora Way.

Witness video captured the sounds of several explosions as firefighters battled the flames.

But the interior flames appeared to resist the water hoses and the boat continued sustaining damage. It quickly began taking on water from the hoses as the flames, possibly fueled by a gas source, continued to burn.

The yacht began listing, and by around 10:30 p.m. firefighters were ordered to evacuate the dock. The boat began slowly overturning onto its side and sinking into the water.

There were no major injuries reported. Two people on board exited safely, though one reported a minor cut to the arm.

There was no word on how the fire started. Authorities said it’s possible ammunition was on board the vessel.

The boat is named The Admiral, but the identity of the owner was not immediately available.

The-CNN-Wire™ & © 2024 Cable News Network, Inc., a Time Warner Company. All rights reserved.

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Will this make my boat sink?

• Thread starter Grunt_Sculpin
• Start date Aug 28, 2007

Grunt_Sculpin

Seaman apprentice.

• Aug 28, 2007

Hey everyone....got a dumb question....I installed a transducer on my new GPS Fishfinder the other day and I started thinking about it after the fact....Will the screws that are holding the transducer and cable attached to the boat take on small amounts of water? I put a marine grade caulking in the pre-drilled holes and then put the screws in and these are also short screws that only go in about an inch but I know that it is far enough to go past the gell coat and into the foam of the boat (It is a fiberglass boat). They are not far enough in to penetrate the inside of the boat though. Will this take on small amounts of water that might saturate the foam in some way causing damage over time? Thanks in advance!  

Petty Officer 1st Class

Re: Will this make my boat sink? put sealant over the screws as well  

studlymandingo

Re: Will this make my boat sink? The marine grade sealant is the proper stuff to keep it from leaking.​  

• Aug 29, 2007

Re: Will this make my boat sink? I had a nasty leak a week ago and traced it back to the screw holes for my transducer in the transom. I filled the holes with silicone and put the screws back and now there is no water at all in my bilge. So yes they can leak if you do not seal them corrctly, but it sounds like you did the right thing.  

Rear Admiral

Re: Will this make my boat sink? Duec66- silicone is the worst thing you can use anywhere on a boat. Take the screws out, remove all of the silicone and replace it with 3m 4200.  

Re: Will this make my boat sink? These screws do not go all the way through the boat so would the water still be able to end up in the boat? Do you think the foam inside the boat would stop the water from going any further? Thanks!  

Re: Will this make my boat sink? You don't want waterlogged foam.. If the hull is breached and water is seeping in the foam will soak it up and never dry out, if left unchecked it will eventually cause the boat to sit lower in the water from all the extra water weight. Use the 3m stuff and seal it up.  

Re: Will this make my boat sink? Some people are unaware that marine grade sealants actually expand slightly when curing as regular sealants do not and may actually shrink slightly. Always use a good quality marine grade sealant by putting some in the holes, on the screw threads, and around the head of the screw.  

Re: Will this make my boat sink? If I take the screws out and reapply the sealant will I have to use bigger screws? I had a hard enough time getting the screws in. Thanks!  

Fleet Admiral

Re: Will this make my boat sink? no need for bigger screws in most cases. The floatation foam used in boat manufacture is a closed cell foam, it takes prolonged exposure for it to become waterlogged (which it will do, eventually, probably). Bigger problem is your transom is probably wood core, any exposure to water means trouble down the road - even if you seal it back up - best to treat the wood with something that will kill the rot. I've heard glycol is great for that.  

• Sep 1, 2007

Re: Will this make my boat sink? agree w/ others, use 4200 or 5200 seal when installing screws and a little more over the top of them. next time, cut a small piece of starboard, 1/2" thick, and mount the transducer to that. then use 4200 or 5200 to mount the whole thing to your hull. no holes in your hull.  

Petty Officer 2nd Class

Re: Will this make my boat sink? What about this stuff? I bought a whole thing and have used very little.. Kill two birds with one stone?  

Attachments

Nova II 260

Senior chief petty officer.

cut a small piece of starboard, 1/2" thick, and mount the transducer to that. then use 4200 or 5200 to mount the whole thing to your hull. no holes in your hull. Click to expand...

Catalina 36/375 International Association

You are here, depth transducer location.

Hi - I have a Raymarine I 50 tri-data connected to an Airmar P319 depth transducer.  Looks like the current transducer was installed in 2015.  The transducer is located under my galley sink. 

I get a lot of false readings and shallow water alarms that are annoying. I do not think I had all these shallow water alarms when I first got the boat in 2017 - not totally sure about that.

The Airmar install guide does not recommend installing behind the keel on a sailboat where mine is located.  Based on my research the best location for a depth transducer is in front of the keel on the center line.  

Do other C36s have depth transducers located under the galley sink?  Is this a decent location for the depth transducer?  

Do I need to move my depth transducer?  

Any other suggestions to get my depth transducer working better?  

Thanks 

Greg S/V Bardo Hull # 828  Seattle, WA  

• Log in or register to post comments

Yes, definitely in front of the keel. It must be in undisturbed water. If there are strong currents below it reads that depth as if the sound was bouncing of the land, even when installed in front of the keel.

Sail La Vie 1999 Catalina 36 MKII, M35B-17031, Coyote Point, San Mateo, CA About Sail La Vie  

Ours (from what I can tell, the original) is under the galley sink as well.  Never had issues...

Matthew Chachère s/v ¡Que Chévere! (Formerly 1985 C36 MKI #466 tall rig fin keel M25) 2006 Catalina Morgan 440 #30. Homeported in eastern Long Island, NY

Depth sounder installed in front of keel near the paddle wheel speedlog.

Durk Nijdam S/V "SILER" Catalina 36MKII - 2001 / hullnr. 2013 Stavoren - Holland

Our's is positioned the same as Durk's. Do you have paint or growth build up? Both can impact performance.

Paul & Wendy Keyser "First Light" Rye NH 2005 C36 MKII #2257 Wing, M35B

Reviving this thread a bit - we have same location, under the galley, but are updating this season. Reading above and also asking online - while preference seems to be relocate them, the responses are less then overwhelming. For those with Galley locations, anyone else finding weird readings and worth relocating? Its seems our old (about to be replaced) speed transducer was faster, but not sure if it was in great shape otherwise. 

My transducer on the 1985 C-36 ft was aft of the transmission.  It gave out mid-season.  I replaced with an Airmar transducer similar to this one:    P95M Chirp-ready In‑hull | AIRMAR

I was able to do it while the boat was in the water.  I mounted it off the center line about where the mast is, but under the starboard cabin adjacent to the mast in the saloon.  While not the perfect location, it works fine.  No worries about hull leakage and readily accessible by removing one drawer.  A good compromise.  If you have the long keel, the offset is 4' 4".

Best regards,

Lou Bruska Sojourn 1985 C-36 Mk-I TR #495 Eldean Shipyard Lake Macatawa (Holland, MI) Lake Michigan [email protected]

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12 adults, 11 children rescued after boat runs aground in Boston Harbor

BOSTON (WHDH) - Emergency crews rescued 12 adults and 11 children Wednesday evening after a boat ran aground in Boston Harbor. 

A Massachusetts State Police spokesperson said the incident happened at 6 p.m. at Rainsford Island. 

Boston police and state police personnel responded. Though everyone was rescued, a Boston EMS spokesperson said one adult was taken to an area hospital after she suffered a shoulder injury. 

A Somerville youth hockey team was having a good time aboard the La Bella Vita boat when the vessel hit a cluster of rocks near the island. A hole was ripped in the hull of the boat.

The marine towing company, Sea Tow, responded and worked to try to recover the boat that ran aground. Though police said crews stabilized the vessel, they were not able to fully salvage it. 

On Thursday, all that could be seen peeking out of the water was the boat’s flybridge, due to the high tide. However, it was low tide when the boat hit the rocks Wednesday.

A Sea Tow representative said crews plan to return to Rainsford Island as soon as possible in hopes of towing the boat to shore.

The Massachusetts Environmental Police had assumed control of the investigation into the incident.

(Copyright (c) 2024 Sunbeam Television. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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63 presumed dead after boat carrying migrants sinks near Cabo Verde off the coast of Senegal

Sixty-three people are presumed dead after a boat carrying about 100 people from Senegal sank near Cabo Verde, an island about 600 kilometers west of Senegal in the Atlantic Ocean, the U.N. International Organization of Migration told ABC News in a statement Wednesday.

Seven people were confirmed dead, and 56 people were missing, UN IOM spokesperson Safa Msehli told ABC News in a statement. People missing at sea are presumed dead.

There were 38 survivors from the sinking, including four children aged 12 to 16, Msehli said.

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This sinking follows an increased trend in migrant deaths and disappearances in 2023 compared to previous years.

At least 1,449 people have died or disappeared on migration routes in the Middle East North Africa region between January and July, a 7% increase compared to the same time period last year, UN IOM Regional Director for the Middle East North Africa region Othman Belbeisi said on social media on Wednesday.

The highest number of deaths and disappearances in 2023 have been in Tunisia and Libya, with 619 people dead or missing from Tunisia followed by 508 people dead or missing from Libya, according to data from the UN IOM's Missing Migrants Project.

MORE: 1,200 aboard 2 migrant boats rescued in Mediterranean

"One death is one too many. This alarming death toll demands concerted efforts to ensure the safety and protection of migrants," Belbeisi said in a statement. "We are all responsible."

The landing of migrant boats in Italy more than doubled compared to the same time period in 2023, the Italian Interior Ministry said this month. The main country of departure for migrants landing in Italy was Tunisia, the Interior Ministry said.

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Boat explodes in Marina del Rey

100-foot yacht explodes in marina del rey.

A boat was completely destroyed in a massive fire in Marina del Rey.

LOS ANGELES COUNTY, Calif. - A boat is completely destroyed after exploding in Marina del Rey .

The Los Angeles County Fire Department responded to a call in the 13800 block of Bora Bora Way a little after 8:30 p.m. on Wednesday, September 18. 

Firefighters say two people safely got out of a 100-foot-long yacht. Neither were hurt in the massive fire, the Los Angeles County Fire Department said.

SkyFOX was over the scene around 8:45 p.m. when the boat was engulfed in flames.

A boat was destroyed in a fire in Marina del Rey. It is unknown if people were inside the boat at the time of the explosion.

As of late Wednesday night, officials did not say what caused the boat to catch fire.

This is a developing story. Tune in to FOX 11 News at 10 p.m. and Good Nite LA at 11 p.m. for the latest.

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transducer location

• Thread starter tgrayson
• Start date Dec 29, 2019
• Forums for All Owners
• Ask All Sailors

where would the best place to install a transducer be on a mac venture 17 swing keel  

What kind of transducer? Speed or Depth? or a Single SDT transducer. In general transducers should be mounted in an area where the water is not turbulent. This would eliminate most areas along the keel/centerboard, off the transom and behind the keel/CB. That leaves the area in front of the keel. for a variety of reasons, the transducer should be mounted as close to the centerline as possible and pointing directly down.  

would like to put an in hull transducer for a depth finder,in front of the keel sounds good,thanks  

tgrayson said: would like to put an in hull transducer for a depth finder,in front of the keel sounds good,thanks Click to expand

Ralph Johnstone

Depth transducer.

V-berth I installed one on a Mac v22 once. I pushed it into a wad of plumbers putty. it was meant as a temp to see if the location worked but two years later I still had not replaced the putty with something more permanent  

good idea , I'll give it a try  

Project_Mayhem

rgranger said: V-berth I installed one on a Mac v22 once. I pushed it into a wad of plumbers putty. it was meant as a temp to see if the location worked but two years later I still had not replaced the putty with something more permanent Click to expand

Project_Mayhem said: My boat came with an old speed sensor in the bow. After launch I found a small trickle of water from it. The water pressure prevented most of the common marine sealants and putties from working. Not wanting to pay to have the boat forklifted in and out of the water I tried plumber's putty. Little by little I was able to reduce the flow. It was able to eliminate it for a few months. The bow was a bit wet at the end of the season indicating that the plumbers putty was allowing water through. Regardless, It saved me $200, I now carry two tubes on-board and I know the stuff could get me out of a jam someday. One more pre-launch project to take care of in the spring... The Norcross/Hawkeye transducer that I bought has a slanted mounting surface to help keep the transducer level despite the angle of the hull. Click to expand

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