I recolored Smoking Mirror's martian riot cop to be a heavy underwater suit. Equipped with a torpedo launcher to fend off giant squid and hungry megalodons.
I also altered the speed for slow underwater movements. Sounds are used from the submarines and work well enough.
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I recently re-played Dino Crisis 2, which has an underwater sequence in a diving suit similar enough to the martian riot cop. I've been working on a Dino Crisis mod (put those PTW dinosaurs to good use!) and this diving suit is used by the player as a single foot unit sea transport to access a strategic location.

I also altered the speed for slow underwater movements. Sounds are used from the submarines and work well enough.
download page
I recently re-played Dino Crisis 2, which has an underwater sequence in a diving suit similar enough to the martian riot cop. I've been working on a Dino Crisis mod (put those PTW dinosaurs to good use!) and this diving suit is used by the player as a single foot unit sea transport to access a strategic location.