When I saw the video to the one Sub channel talking about the design, as much as everyone was having fun meme'ing over the Logitech controller, the material physics was super obvious. Either the viewing glass shattered because it was beyond its depth or the pressure/heating cycle on the carbon fiber failed. Either way, it was going to be a catastrophic implosion. (Considering they did have actual, redundant buoyance control meant, it wasn't at the top or it'd have likely be found.)
If you've ever watched a high-end race car, realize those carbon fiber bodies and parts are given X-ray scans fairly regularly to check for issues. For something like F1, it's after most races. Carbon Fiber is completely unsuited for deep diving (shallow water diving it's probably fine, maybe, but that's a decade of failure analysis needed).
RIP to the unfortunate paying travelers. Rest in pieces to the hubris of the moron CEO. At least, like a good captain, he went down with his ship.
(Oh, and most of the engineering & executive team should face prison sentences. This was criminal negligence.)