this post was submitted on 02 Apr 2026
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https://www.popularmechanics.com/military/weapons/a19061/britains-doomsday-subs-run-windows-xp/
(Though, of course, that's alledgedly simplifying a lot to make it more click-bait-y: https://ukdefencejournal.org.uk/no-trident-doesnt-run-windows-xp/ )
Of course a submarine's systems won't be connected to the internet, but using a Windows base with a "Custom Support Agreement" still gives a private US corporation the power to cripple their subs.
IMO something so critical to defense should be built by British developers, and based on OpenBSD.
Further to this, there isn't a 'launch the nuclear weapons' application which controls things. Windows is used for the day to day admin - producing the paperwork required in any organisation - but the actual control systems, for the submarine, the weapons the reactor etc are not running off windows.