Jack gripped hold of the other side of the wheel to add his own weight to twisting it. With the efforts of the two of them it didn't take too long for the hatch to squeak and release open. Using both his arms he pushed it up and open. Beyond it, there was light, and it looked like natural light too.

"Okay, you first, Doctor," Jack said, offering his hands out to give him a leg up. "Climb up me then tug me up."

He looked back the way they came. The water was still coming. "And we'd better be quick."