@Kraco:
It's fairly usual in rpg-games to get access to content you're supposed to play later on. There was no pressing need to use the key, it was dumb. And he could have ask his healer friend. "But she has a trauma", OK, SO DOES HE, more reason why he shouldn't have used the key. He's an idiot.
Also agreed with Buff, even 4 minutes would have been too much. I actually read it as "4 minutes" at first, then realized in the next scene that it was HOURS. You know, I'm fat so I can't talk from experience, but can regular people even run 4 hours nonstop? I doubt it.
Sharks would actually kill you. Now building-size, fast monster centipedes? THOSE are easy to outrun /s.