There was a front viewport... which turned out to be rated to only 1300 meters.
Yes, rated for 1,300 meters and they’ve been taking it down to 4,000 meters. Guess those youngsters they hired didn’t read up on the specs, plus there was not testing. Bet that negligence breaks the risk waivers as I am sure billionaire passengers surviving families have good lawyers.
The front viewport was also the entry/exit for the vessel. Bolted on for the outside, so once in, you’re not getting out on your own.
My gut says never enter a craft like that.