first step

What are you trying to find? Coins? Relics? Iron objects? Size? Depth? Land? Water?
 

Unless it's one big solid chunk, there isn't a detector made that will find something like individual coins, or, similar sized objects that deep. A larger solid metal object (something 15cm or bigger in diameter) a two box unit might work for you. GPR might work too depending on target composition, shape, and depth.
 

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