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McSailing said..I assume you have the moisture absorbent strips inside the case. All Gopro's with the waterproof case will fog up without them.
If it fogs up without the strip it means its waterproof.

Basically I had a Hero 3 and it drowned last week - case leaked somehow and she's now in the bin... And yeah, always used the strips- they worked great. But now planning to buy the much cheaper (sub $200) new Gopro Hero and was hoping it wouldn't need the strip as the housing is part of the camera. Though it sounds like it will need strips (or the fridge trick) like the more expensive models. Time will tell I guess...