this post was submitted on 29 Nov 2024
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Warships absolutely have a "self destruct button" it's called scuttling. Done to deny the enemy the capture of the ships, or to lodge a wreck in an important location, so it blocks passage. Usually a "self destruct" is ships scuttling, but for space - you can't really do anything to a spaceship to "disable" it and prevent it from ever being used, unless you blow it to bits. Also, explosions are cool.
Same thing for abandonned tanks - burning those is often done - especially if you just lost a track, and the tank is fully operational but cannot move. If you have no chance of retrieving the vehicle, it's better to burn it than to deny the enemy the knowledge about its system, weakpoints, comms etc.
Except for
Yeah, so in summation - blow it up.
Most of your suggestions require working engines. Shaking the ship apart might make the ship itself unusable but doesn't do anything about on board equipment or intel. A "scuttling" equivalent needs to work when the ship is mostly, or even completely, non-functional, and needs to either destroy everything aboard or make it not worth the effort of recovery.
If you have a second ship then you could use its thrusters.
I also doubt that any explosion short of nuclear is going to destroy most equipment and intel considering the ship is in space and has large parts vented to space (due to combat damage or design). Maybe if you line or fill all the things you want to destroy with some explosives but I wouldn't want to be on such a ship. More likely you'd manually lay down explosives from the ammunition if scuttling is required and then detonate it but not have it already there at the push of a button(assuming you're not using a nuke for every ship).
In Star Trek at least, where this trope is probably the most firmly established, the self destruct involves antimatter annihilation, which is arguably in excess of nuclear.
...not really the point, the point is that either you have a nuke (or better) or an explosion isn't going to be sufficient to destroy Intel and machinery.
Unless you can justify having a built in nuke/antimatter bomb in the ship then it's not something a real world ship would have(excluding things like special military ships maybe).
Even if you have an antimatter reactor then it would still have to be a procedure on the order of "we're welding the safety's shut and overriding everything we can give us a few hours to rig the ship to blow" not "whoops pushed the self destruct button"
Point being, a colony ship or some science exploration vessel doesn't have a built in antimatter bomb at the push of a button.
I'm not sure where I argued to the contrary. The ships in Trek with self-destruct capabilities are all military (or pseudo-military) vessels that are explained as literally having a procedure such as you describe.