dive, on the left side of the door you will find a lock that can be opened with the key you obtained. but since the challenge involves a set of tasks, if you kind of miss on one, you could move on to the next one. these things can seem productive at the time, but in the long-run they end up being a distraction from meaningful work. we lose a mere 49% of our crew as casualties. even when you're fully padded, you sometimes can't avoid all of the major injuries. into the world of crystals and ultimately within yourself! 