OceanGate’s ill-fated Titan sub relied on a hand-typed Excel spreadsheet
“This is an idiotic way to do navigation.”
Excel is one of those tools that punches way above its weight class. Which is why it's so common to see in places where it should have been replaced by a proper database years ago.
https://xkcd.com/1667/
The sub's implosion was probably Clippy's fault