This never really happened in the Apollo missions, or any other rocket launch... but what would theoretically happen if something exploded (let's say, the oxygen tanks) and caused a hole in the side of the spacecraft?
Would the crew be sucked out and killed instantly, similar to an airplane, or would the spacecraft automatically try to correct the error and seal the hole?
Also, in the unlikely chance that a hole appears on the side of a spacecraft, what is the normal NASA procedure?