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I'd compare it with going into space, there are a lot of similarities: the level of risk, the technical challenges, the opportunities for scientific research, the risk of death, the reality that you'll die a horrible death if you try and leave the vessel, monsters, alien species*, nobody can hear you scream etc.
But I guess implosion is more likely than explosion.
*there's still a lot of unidentified deep sea life
Fox
Sumo
There was a journo who went down in the currently missing sub this time last year and twice had to abandon due to technical issue. Apparently it's so common they go for 5 days at a time so they get a few attempts for one to not have issues.