"Your hand was all sweaty!" he snaps back. Because acting like a child is the best act in a place like this. He swims over to where she's pulled herself out and does the same.

"We've got to get back there, shut the whole system down. Who knows what else it's planning to keep us from pushing that button!"

The darkness in this cave bothers him. So much could be lurking down here. So much he isn't really prepared for.

"Come on," he says. "Let's see what we've uncovered down here."