There is a market for large anchor that have just been lost. Many times, when a vessel pulls into port, they set the anchor block from the charts. Many, many times, they mix up the units the charts shows, and the chain breaks at the block.
The Coast Guard has certain minimum requirements, and if the ship doesnt meet them, they arent going anywhere.
Usually you run the area with the sidescan, then drag an anchor hock to try to grab onto the length of chain (if there is one).
Then you have to crane it up, so the chain can be re-attached. Its about a half to full day of work, depending on the urgency, from $10K to $15K to do it.
Hang around a container port for a while, and you will get one or 2 a week.