I never thought of the Pirate connection. Maybe its airholes for them to breath through. :rolleyes:

I was out there earlier today and saw about 25 holes like this. If it is Pirates, then looks like I am dangerously close to being attacked soon!!! \:D

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1/10 - 1/4 acre pond plus 16 ft deep/ Plus 40 ft by 20 ft by 6 ft deep koi and fathead minnow pond next to it. Upstate NY