I've owned an S8 for >2 years and I think it can safely be used underwater. I've gone swimming with it in the sea, swimming pools, washed it under tap water re

I've owned an S8 for >2 years and I think it can safely be used underwater. I've gone swimming with it in the sea, swimming pools, washed it under tap water regularly and even dropped it in a bowl of yogurt once. YMMV of course. My guess as to why they won't honor their warranty probably revolves around return fraud. It must be trivial to damage the waterproofing intentionally, get the phone water damaged then demand an exchange. It's such a big problem that even the Apple store where I live has much stricter return policies than they do in the US.