Looks like those 7 backup systems to return to the surface failed.
Doesnt sound like that Logitech Wireless Gamepad controller (G F710) used to power the Titan for $30 was worth a ****.
That device has been reviewed thousands of times by "gamers" since 2010 and it suffers from irritating connection problems. - - - Never mind that it is only compatible with decade old Windows and Chrome systems. Garbage in, garbage out.

A debris field was found by a remote vehicle from the U.S. and Canadian Coast Guard.
The 96 hour oxygen mark has come and gone.
Cant imagine being a family member.
Press Conference at 12 Noon PST by the Rear Admiral.
Debris Field Found During Search For Titanic Submersible: Coast Guard | HuffPost Latest NewsPS. When the carbon-fibre hull arrived from manufacturing, it was 5" thick instead of the 7" thick that had been expected by company engineers. A former employee had warned Oceangate about their decision to rely on sensitive accoustic monitoring (listening to cracking or popping sounds made by the hull under pressure) to detect flaws, rather than a scan of the hull.
"Accoustic monitoring would only show when a component is about to fail, often only milliseconds before an implosion . . . and would not detect any existing flaws prior to putting pressure onto the hull," said former Oceangate director of Marine Operations, David Lochridge.