SuperOx,

Googling "ATC2K waterproof membrane" go me to this.

Utah Trikes Tip - Modifying the ATC-2000 camera for better audio and video

I've seen others, I skimmed this one and it has some interesting info and a good how-to. I HAVE NOT DONE THIS MYSELF so please, mod at your own risk I hope it works out for you. Let us know how it goes if you do