Corrected entry: When Arthur and Ford get flushed out of the Vogon ship, the airlock's exterior hatch changes from a sliding design (as seen inside the airlock) to a hinged design.
DaveJB
19th Jan 2005
The Hitchhiker's Guide to the Galaxy (1981)
19th Jan 2005
Correction: Actually, it would make quite a bit of sense that there are two doors. If one develops a leak, the other can still keep the air in.