Sunken Boat Recovery: The First 48 Hours
By Gus Marchetti, Salvage master. Reviewed by Amanda McCallister, editor.
Marine Salvage & Recovery | Hull & Bottom Cleaning The call came at 4:18 in the morning. A 38-foot Duffy lobster boat had gone down in 30 feet of water off Block Island, with 250 gallons of diesel aboard. By 9 AM I was on the dock with a salvage contract in my pocket and a dive team pulling up. The first 48 hours decide the whole job. Call it the golden window. You get a vessel on the bottom, and every hour costs you money — in pollution response, in lost gear, in the chance the hull suffers more damage. And the weather doesn't wait for your paperwork. So here's how we actually work that window. No theory. Just the grit you need to answer the one question that matters: can we get her up before the sea takes her for good?
Get Eyes On It Before You Touch Anything
First thing you do is get a diver in the water — or a ROV if the depth's over 100 feet. I've used Deep Trekker ROVs on a few jobs, but they can't feel the hull the way a hand can. A diver with a flashlight and a slate can tell you if the hull's intact, if the propeller's buried in mud, if the rudder's bent, and where the fuel is leaking from. That survey sets every other decision. You need to know if the vessel is sitting upright, on its side, or inverted. That changes how you attach lifting straps, how you pump water out, and what kind of pollutants you're fighting. I take soundings of the interior using a handheld depth sounder through the hull — kind of a trick I picked up. It tells you if the compartments are full of water or air. And I always write down the tide and current conditions at that exact spot. It's amazing how many salvage plans fail because someone forgot the bottom is soft mud and the wreck has settled a foot by day two.
Contain the Pollution Before You Worry About the Boat
The Coast Guard and state environmental agencies care about one thing first: the sheen. If there's diesel or oil leaking, you're in a remediation mode. We deploy a boom around the wreck immediately, even if the leak is a trickle. Get the right boom for the conditions — a hard boom in current, a sorbent boom in calm water. We carry 200 feet of oil-only sorbent boom and 100 feet of hard boom on the truck. Slickbar makes a decent, tough boom; we've used it for years. Plug and pump is the goal. Divers go down with wooden plugs, rubber stoppers, and marine epoxy to seal vents and openings. If the tanks are intact, we can pump the fuel out the vent line with a portable diesel pump. We've used Grindex pumps for this; they're submersible and reliable. If the tank is breached, we have to suck up the oil from inside the hull or off the water surface. That's a mess, and it's where a good vacuum truck pays for itself. But a lot of it comes down to just being quick and improvising. I once used a wet-dry vacuum and a garden hose to siphon a leaking fuel tank on a 40-footer. It worked.
Stabilize the Wreck So It Doesn't Move
Once the boat is on the bottom, it's never still. Currents shift it, the tide lifts it, and if the bottom is soft, it sinks deeper. So we stabilize it before any lifting. That means setting anchors or ground tackle to hold the hull in place, and sometimes driving steel pins into the seabed. We rig lifting points — typically heavy shackles and wire slings around the keel or through existing through-hulls. But you have to be careful: the hull might be rotten or cracked, so we use broad pads or spreader bars to distribute the load. Another thing: the hull shape. A boat that's resting on its side can be rolled with the current, or we can use an airbag to wiggle it upright before lifting. We use Subsalve lifting bags, which have a huge margin of safety. For a 40-footer, a 5-ton bag might be enough, but we often use two 10-ton bags to get the stability. Call it conservative. The last thing you want is a bag shifting and the wreck rolling on a diver. We also monitor the wreck during this phase. Set a tide gauge or a simple line on the bow. And we log the weather forecast. If a front is moving in, we work double-time to get containment in place, because a storm can turn a simple salvage into a week-long nightmare.
Plan the Lift and Get the Paperwork Moving
The actual refloat is usually not in the first 48 hours. That's okay. In the first two days, you're planning the lift and getting approvals in place. You'll work with the boat's insurance company — or the owner, if they're self-insured — to sign a standard salvage contract. The most common is Lloyd's Open Form, which is a 'no cure, no pay' agreement, though I've seen more and more state-specific contracts. The Coast Guard will want a salvage plan (sometimes called a COTP, Captain of the Port, approval). And if the vessel is a hazard to navigation, you might get the Army Corps responsible for removal. But that takes more than 48 hours. You should also be talking to a crane service and a tow company. For a boat under 40 feet, a conventional wrecker can sometimes do it. For bigger boats, you need a barge crane or a floating sheerleg — call the company 'Titan Salvage' or 'Resolve Marine' if it's a big one. You're timing the lift with slack water if possible, to miss the current. And you're prepositioning pumps to dewater the hull as it breaks the surface. Here's where a lot of rookies go wrong: they don't account for displacement. A submerged, water-filled boat weighs much more than its dry weight. A 30,000-pound vessel can be 50,000 pounds under water. So the lift plan has to be based on the actual weight, not the brochure. We use a calculation called deadweight, and we add a safety factor of 25 percent. Then we make sure the crane or airbags can cover that. If in doubt, we use more airbags. Always more.
Frequently Asked Questions
How long does a typical sunken boat recovery take? Depends on the plant: depth, bottom conditions, weather, and how fast you get people and gear on site. The first 48 hours are for assessment, pollution control, and stabilization. The actual lift often happens on day three to five, sometimes longer if you're waiting on a crane barge or permits. Do I need a permit to recover my own boat? Probably. If the boat is a hazard to navigation or leaking significant fuel, you'll need Coast Guard approval. Even for a simple private salvage, local harbormasters often want a plan and a bond for potential pollution cleanup. Call them before you start diving. How much does sunken boat recovery cost? It varies wildly. A small boat in shallow water with minimal pollution might cost a few thousand dollars if you hire a local diver with a lift bag. A larger boat in deep water or with heavy fuel load can run tens of thousands, especially if you need a crane barge. Most salvage companies charge a day rate plus equipment, with a mobilization fee. Will my boat insurance cover the recovery? Sometimes, if the sinking is a covered loss — storm, collision, or mechanical failure that causes the boat to take on water. But many policies exclude salvage or have limits. Check your policy and talk to your insurer early. Lloyd's Open Form and other salvage contracts often involve the insurer directly.