Get some yellow polypropylene hollow braid floating rope which is used for swim lines because it floats. Attach about six feet to the anchors, and it will float straight up vertical, making it easy to locate underwater because it is bright yellow and you have a general knowledge where it should be located.
Comes in 3/8" or 1/2", is sold by the foot and is a low price.
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 .... Banned for life from local thrift store!
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