The Complete Book of Spaceflight: From Apollo 1 to Zero Gravity

Apollo Lunar Module Alan Bean, Lunar Module pilot for the Apollo 12 mission, starts down the ladder of Intrepid to join
Charles Conrad, mission commander, on the lunar surface. NASA
tions also meant the absence of bunks, so that the
astronauts could only rest on the floor, and the
absence of an airlock, so that the module had to be
depressurized and repressurized before and after
every excursion. For this reason, and to avoid being
locked out of their vehicle so far from home, the
astronauts left the hatch slightly ajar during their
moonwalks. 166
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