How he gets rid of _air.

MID-DECK FLOOR (a) Crew module. * ALUMINUM CONSTRUCTION * MECHANICALLY ATTACHED * FRAMES * BEAMS * FLOORS * EQUIPMENT SUPPORT FLIGHT-DECK FLOOR INTEROECK ACCESS 5 PRIMARY INTERDECK ACCESS SIDE HATCH (a) Launch/entry. E WORKING/HABITABILITY PROVISIONS FOR FOUR PERSONNEL (NOMINAL.