I planked Gato with 4mm ply which frankly wasn't the best quality, it was light, but 6mm would probably have been better.
Close up reveals the damage, we were lucky that the breech was contained and only flooded the first compartment, see below the buoyancy chamber is divided by a bulkhead about half way, which also seems to have provided more impact strength.
The hole after initial surgery, once I've tidied up the incision a backing piece from 6mm ply will be epoxied to the inside and a piece of 4mm will go in the hole plus some more epoxy filler to smooth off before the paint.
ouch!!
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