These are genuinely dangerous things to do. The website is written in a light-hearted fashion but you cannot overestimate the risks involved in taking part in this adventure.

Your chances of being seriously injured or dying as a result of taking part are high.  Individuals who have taken part in past Adventurists' adventures have been permanently disfigured, serioulsy disabled  and even lost their life. 

This is not a glorified holiday, it's an unsupported adventure and so by its very nature extremely risky. You really are on your own and you really are putting both your health and life at risk. This is what makes them adventures.