The comic basically says:

Users: Please run Reddit decently and do stuff people have told you to do for so long.

u/spez: Fuck you. We need to become profitable and to do that the API has to be shut down.

Users: Then, with the enshittification of this website, with the horrible management of once a great land, Reddit will crumble when the IPO approaches and investors get their hands on it. So just go to Lemmy where none of this is happening lmao

If you mean the OceanGate submarine, it seemingly spectacularly imploded after its carbon fiber structure gave in to various microfractures. If that really is what happened, the water pressure killed the crew faster than their brains would’ve processed anything.