Yesterday a violent summer thunderstorm tore through the harbor in Rockland, Maine with wind gusts reported at 70 knots. That in and of itself is enough to give a sailor palpitations, but what happened as a result was even scarier.
At the height of the storm the small boutique cruise ship American Independence was torn from the dock she was tied to and set drifting across the harbor. This short and unplanned voyage was captured from the cockpit of a nearby sailboat and (of course!) posted on Youtube:
The cruise ship was ripped from her dock when the dock and pilings failed. If you look closely at the video you can see her dragging dock lines and pilings from her bow. This has the potential to seriously limit the ability of the Captain to get the vessel under control because he has to worry about fouling lines in his props and thrusters.
Of course the chances of a large cruise ship coming at you while you are anchored are pretty small, but in a sudden severe squall in a crowded anchorage, it is not at all unusual to see multiple boats go adrift. If one of those is coming at you, you need to move. If your own anchor starts to drag in severe conditions it might not be possible to recover it and slipping might be the only option to get things under control fast enough to avoid serious problems.
What to Learn
Having an uncontrolled vessel drifting down on you–of any size–is only one example of why you might need to exit an anchorage NOW, not later. Your options in this case are very limited. You certainly would not have time to weigh anchor and get underway. Really your only choice is to abandon the anchor and chain in place, and run away. Could you do that fast enough to do any good? A small boat might damage your boat, a vessel the size of the American Independence hitting you would be a life-threatening situation.
For this to be a practical option, a couple things would need to be ready ahead of time. You would need to have the attached the chain to the boat properly. That means NOT shackled to the attachment point in the depths of the chain locker, but rather attached with a length of line long enough to come up on deck and then have an available knife of suitable size and sharpness to cut it.
Of course, if you do this, your anchor and chain are now on the bottom of the ocean. That’s a better scenario than getting run over by 2000 tons of steel and who knows how many tons of very well fed cruise ship passengers, but still decidedly sub-optimum. It is possible, but by no means assured, that a diver could recover it later, but what can you do now to make that unnecessary, or at the very least easier?
The answer is a very old technique in sailing, dating back hundreds of years, at least: Buoy the anchor chain. Attach a float to the anchor chain big enough to stay at the surface when weighed down with chain to make it easy to recover. Let’s do a little math around things we have on board to see what might work.
An empty 5 gallon jerry jug might be an option. It would displace 5 gallons of water, or (5 * 8.34)=41.7 lbs. Since our 3/8″ HT anchor chain (identical to 10 mm ISO chain) weighs just about 1.5 lbs per foot, an empty 5 gallon jug would support about. (41.7 / 1.5) =27.8 feet of chain. Not a very useful quantity. Let’s step up our game a bit. Our largest fender is 18 inches (1.5 feet) in diameter and 3 feet long. (1.5/2)^2*3.14*3=5.3 cu feet. This would displace 62.4*5.3=331 lbs of water, enough to float 331/1.5=220.7 feet of chain. That’s more like it.
After the anchor is set and everything is ready to spend the night, the fender is attached to the chain with a snap shackle over the bow pulpit. With this preset in place, slipping anchor is now a fast procedure in an emergency.
- Disconnect the chain hook that is the chain safety.
- Untie the snubber line from its cleat.
- Throw the fender/float over the side.
- Loosen the windlass clutch and let the chain run out.
- When the line that attaches the end of the chain to the boat comes out of the anchor locker, cut it.
- Run away! Run away!
- When everything is back to normal, return and recover your floating chain.



























