Contour built its ContourGPS Waterproof Case to prevent snow, water, sleet, hail, raging rapids, monster surf, and itty-bitty puddles from ruining your ContourGPS camera. This hard case features two latches to seal out the wet and doesn’t eliminate your favorite features like a single record button and laser alignment. And while this case is only compatible with the ContourGPS camera, it does work with a variety of Contour TRail Mounts, including the profile mount, rotating flat mount, surf mount, windshield mount (with adapter), roll bar mount, flat Mount, and goggle mount (TRail Mounts sold separately).
I haven't taken the contour ROAM2 under any serious amount of water, but at my work while taking some people caving, they used this camera and there was not sound, you could only see people moving their lips. but what else would you expect from a waterproof case, just something to think about.