A self-destruct is a mechanism which causes a device to destroy itself under a predefined set of circumstances. Self-destruct mechanisms are sometimes found in high security data storage devices, where it is important for the data to be annihilated in emergencies.

Self-destruct mechanisms are also found on devices and systems, the malfunction of which could endanger large numbers of people. The Space Shuttle Solid Rocket Booster rockets, for example, are wired with explosives so that the Shuttle can be destroyed in the event that it loses control on launch and heads towards a populated area. This feature can be seen in videos of the Challenger explosion. After the initial disintegration of the shuttle, the two solid rocket pods continue flying out of control until they explode simultaniously several seconds later. This occurred when the Ground Control Officer decided that the separated pods had the potential to endanger those on the ground and detonated the self-destruct system.

Use in fiction

Self-destruct mechanisms are a common plot device in science fiction stories, and were frequently used as a mode of plot development in the Star Trek series. On Federation starships, a self destruct mechanism is available. This option is open to the senior officers on the starship in case the starship falls into enemy hands or becomes unworkable for some reason. It was also used as a form of kamikaze weapon, turning the starship into a powerful bomb.

It usually had a time limit, so that crew could escape via the escape pods.

Examples of self-destruct in fiction:

• Star Trek: The Original Series (episode "Let That Be Your Last Battlefield")
• Alien
• Resident Evil video games
• Star Trek III: The Search for Spock
• Star Trek: The Next Generation
• Star Trek: Deep Space Nine
• Star Trek: First Contact
• Star Trek: Voyager
• Predator
• Mission: Impossible ("This tape will self-destruct in ten seconds.")
• Metroid
• Mighty Morphin Power Rangers (Alpha 5 activating his self-destruct program to save himself from Primator)