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OceanGate’s ill-fated Titan sub relied on a hand-typed Excel spreadsheet
(www.theverge.com)
This is a most excellent place for technology news and articles.
If it was setup properly, you just us an if statement like, "if communication lost to control for t>5 seconds, release balast" or something like that. I had 0 issue with the controller being an ots consumer good. The rest was an idiotic design, I won't even say it was engineered.