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

Chloe