need help with waterproof camera?

I recently got a camera that says it's waterproof for a snorkeling trip i'm going on in june. it came with a few manual packets, and i found some conflicting information. one said that this specific make and model is indeed waterproof, and is good to use in up to 9 feet of water. another was a more general camera care manual to keep it away from water, because if it gets inside it will electrocute you. now, using my common sense, i looked the camera over, and saw that it looked pretty sound (the battery is sealed up tight) and there were no holes or seams except for one part... the microphone hole for taking video. so the question is what to do? put tape over the hole, stick it in the sink and see what happens?