It’s not the use of Excel, which is best-in-class software, it’s all the room for error they introduced.

The OceanGate team tried to perform these updates at least every five minutes, but it was a slow, manual process done while communicating with the gamepad-controlled sub via short text messages.

Dumb, but I don’t see that having anything to do with the implosion, just a wonky way to navigate.