The pistol shrimp are driving me crazy. Here are a couple of links to you can see what they are and why that make such loud noise through the hull of the boat. Popping noise is non stop on the boat! They are living on my hull with all the other sea critters. I think they are trying to get through the hull at times.

https://www.youtube.com/watch?v=KkY_mSwboMQ
https://en.wikipedia.org/wiki/Alpheidae