There is literally nothing else to do other than gawp at a grave site from a small window
Most, if not all, of us will have 'gawped' at a grave site in our lifetimes . It's not taking it in turns to peer through the window, there are cameras and so on. Plus it's about the whole experience of travelling to and exploring those depths and environments, or they could just view previously recorded footage. One of the passengers has set records for travelling to similar depths. What an experience it must be, if you had the money, and the nerve.
I agree, and said, that they will have understood the risk involved. Of course.