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Missing Titan submersible is operated by a cheap game controller
(videogames.si.com)
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That or lost connection/battery.
The only wireless controller I ever owned would continue any repeating input active when connection dropped, if batteries or wifi died; they could just be cruising at max speed off in whatever direction they were facing, until the motor batteries run dry.
You'd like to think they'd carry backup interface, or even just use a wired controller, but this whole op sounds pretty McGuyver top to bottom.