My EM1 MK2 got a bit of water, and was totally dead. Olympus refused to repair it, claming I submerged it in water. But it was a little splash. Olympus claims on its flagship being waterproof is all a lie, what's worse, they refused to claim warranty.
That's why I sold my entire Olympus sub set (it's my main system anyways, it's far from PRO) off and never to touch it again.
And never get underwater housing from online, it's all fakes. Bought one for $200+ Nautica, it failed me.