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Self-destruct is a mechanism that can causes a device to destroy itself under a predefined set of circumstances. The self-destruct mechanism is usually the most complete way to destroy the device containing it. For that reason the self-destruct mechanism can be used to destroy devices that are meant to be discarded.
Self-destruct mechanisms are found on devices and systems where malfunction could endanger large numbers of people. For example, the Space Shuttle Solid Rocket Booster rockets are equipped with explosive charges so that the boosters can be destroyed in the event that they go out of control on launch and endanger a populated area. This feature can be seen in videos of the Challenger disaster. After the initial disintegration of the shuttle, the two solid rocket boosters continued firing until they had exploded simultaneously 37 seconds later. This occurred when the Range Safety Officer decided that the separated boosters had the potential to endanger those on the ground and activated the self-destruct system.
Some types of modern land mines are designed to self-destruct, or chemically render themselves inert after a period of weeks or months to reduce the likelihood of friendly casualties during the conflict or civilian casualties at the conflict's end. However, these self-destruct mechanisms are not absolutely reliable, and most land mines laid historically are not equipped in this manner. Another form of a self-destruct can be seen in the naval procedure of scuttling, which is used to destroy a ship or ships to prevent them from being seized and/or reverse-engineered. Also self-destruct mechanisms are sometimes employed to prevent an apparatus or information from being used by unauthorized persons in the event that it is lost or stolen. For example, they may be found in high-security data storage devices (e.g. IronKey), where it is important for the data to be destroyed to prevent compromise.
Self-destruct mechanisms are a frequently-seen plot device in science fiction stories (such as those in the Star Trek fictional universe). Self-destructs in fiction have been seen on military installations, spaceships, and in an artificial intelligence, destroying itself due to cognitive dissonance. In many such stories, after a time limit is reached, a large explosion will occur, destroying everything around the site. This is a well-used method of creating tension as the characters would have a limited (usually short) amount of time to escape or to disable the self-destruct.
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