> but shouldn't there be a briefing where participants learn about something like that? They are in a sealed tube underwater where most of the systems are auto

> but shouldn't there be a briefing where participants learn about something like that? They are in a sealed tube underwater where most of the systems are automated. Practically, the only thing they can do is sit down and hang onto their butts. Even the press interviews reveal a simple button to submerge or ascend. Beyond the simple controller for limited maneuverability there isn't much anyone can do from inside the capsule. For untrained crew or passengers this is probably the best setup. But there should have been a lot more critical engineering involved before even a single crew dived.