Seems like it erupted suddenly and unexpectedly.
I don’t see how anybody could survive that.
Seems a little ill-advised, of course, timing is everything. For example, I've got my visits to volcanic craters timed for the 22nd century. I'm erring on the side of caution.
“A GeoNet agency camera appeared to capture a group of tourists walking through the volcano’s crater at 2:10pm - minutes before the eruption.
“The camera - which takes a new still image every ten minutes - did not take another and is believed to have been destroyed in the blast.”
https://www.thesun.co.uk/news/10511437/new-zealand-eruption-white-island-tourists-dead/
[Tourists hiking on the crater floor. Not the place to be when things go BOOM!]
They could have MP3’s of “Learning to Fly” (only this time, literally)