I use this attached to a stainless steel cable,I do the same thing but up to 300’ in the ocean.
https://www.seaview.com/mobile/Produ...de=SEM-600-SYS
They have a smaller version,a bit pricey but when you attach the cable to them you never lose it and you can tow it behind a boat if you want to go out further,saves a lot of time.
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