Here be dragons

I'm participating to a kind of scavenger hunt. At one point we have to get to a underground place, but when we reach it it's partially underwater The water is cold and murky enough that we can't see the bottom. As we dive in, another team spring out of the water; it's a trap. We manage to push them to the door, then out. I tell part of my team to make. sure that .they can't .get back. in, and we move to open the door at the back. It lead into another room, longer than larger, with racks on the walls. There's a lot of differents things here, unusuals weaponry, bike in neon colors, and what looks like a dwarven armor next to a jeager suit.