Recommendations Needed: Submersible Camera Traps

Hi everyone, I am working on a project where we want to set GSM cameras up on the seashore. Theoretically the cameras shouldn't go under water but in storms there is a chance that they will get submurged.

Anyone done similar and have any recommendations for cameras that could cope with this?

A normal camera has already been tried (and ruined) and we also tried putting one in a plastic box but the hole for the antenna reduced its waterproof level and the flash was reflecting off the case and ruining night shots.

Any thoughts would be much appreciated