If the chain will come to the surface then buy a 100 or so pound pull magnet and some nylon cord. I dropped mine before in about 12 feet of water, took about 5 minutes to get the end of the chain and pull it up. When you remove the ball in the fall, buy a small float ( about 2 inches by 3 inches) attach it to the chain with a nylon cord long enough to allow the chain to rest on the bottom and the float on the top, problem solved the next spring.
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