That said, the book is great read. Especially if you're into diving. It's just that it should not be read as a role model for anything but reckless regard of ones life.
Not to drift completely off-topic, here is a link to a long thread about Thailand cave rescue from the cave diving forums[1].
[1] http://www.cavediver.net/forum/showthread.php/35242-Football...
https://www.everyonegoeshome.com/16-initiatives/
This is related to firefighting, but it's interesting to see what some of the things we are trying to fix are in terms of saving lives, and little is around technology, and much in the way of culture, safety.
His dead is bad news not good news. Everybody would be better off if this man survived. Him dying while trying to save others does not make it less tragic.
Let's not minimize his death by saying (as sibling comment did) that his dead somehow matters less or is less important because he was rescuer and thus different. His life had same value.