As the elevator began its descent, Lemke climbed the indentations set in the wall to the maintenance hatch in the ceiling.  He jerked at the hatch twice before it slid back, revealing the vast space of the Saturn-1 habitat's transportation core.  He slowly climbed onto the roof of the elevator, keeping his eyes firmly fixed on the metal surface.  After he was out he slid the hatch shut and lay motionless on the roof of the elevator, his eyes closed.  When his sense of balance had recovered and his stomach stopped churning, he turned over on his back and looked out at the transportation core.