Astronaut Gus Grissom splashed down in his Mercury-Redstone capsule in 1961 the doors blew open before a Navy helicopter could attach itself. A dangerous turn of events that nearly led to Grissom drowning in the Atlantic.

As a result, the explosive bolts were removed from future designs.

Grissom was later assigned to the crew of Apollo 1, which was tragically lost on the tarmac when an electrical fire began in the capsule. The crew was unable to escape, partially because they could not open the capsule doors.