I would also say that I don’t think people SHOULD be risking their lives at this point. We’re looking at a case of people who took an informed risk and understood that there was danger associated with the recreational activity they were undertaking. These people either had vast monetary resources and could have consulted the best experts in the world, or had significant prior experience and knowledge. While obviously withholding information interferes with informed consent, and that may or may not have played a role, I don’t think this is morally equivalent to rescuing someone from a burning building. There’s also simple probability - the odds of rescuing them alive and well aren’t good, and to put someone else’s life at risk for the off chance that they succeed would be unethical in my opinion.