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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.
Frankly that controller was probably the most reliable part of the sub
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.