Maybe depth compressed bottle side

I found depth compressed bottles on May 19 on Seawall Beach in Galveston.  I think the bottles were tied to a fishing rope and pulled down under.  They look like they are depth compressed.  I have not found out where they are from.  I tried an experiment to see how crushed three bottles would get if I took them down to 2 ft, 3 ft and 5 ft.

Depth bottle experiment

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