Oh my.

Why did I ever doubt this show?

Patchy better have survived that 'nade. I'm sure he did, given that he's survived face haemmorhaging and speargun through the lung.

But about Charlie: I can see why Charlie didn't get the diving gear on first, because he was all overconfident. And I can just about see why he stayed inside the room - to stop Desmond getting in because of Penny, and thus him dying (Charlie wouldn't have had the time to get onto the outside of the room and close it, 'cause Des would have beat him to it). What bugs me is that... the window was big enough to be worth trying to get through. You could see that when Patchy was knocking on it. It would have been a close fit, but he could have made it. It annoys me that he didn't try - but that's the character having made peace with dying, rather than any actual errors.