Originally Posted by
Zaphod Beblebrox
There must be a window, with explosive bolts; so the astronaut....
So the Astronaut Pilot can see out and escape if necessary...
And they had to reconsider that after it turned out that the explosive bolts could fire unintentionally in the event of a short circuit (e.g. in case of contact with water). They almost drowned a Mercury astronaut (Gus Grissom) because of that one!