I think this makes the rounds here periodically as a submission, and may help answer your question: https://nsscds.org/wp-content/uploads/2018/05/Blueprint-for-

I think this makes the rounds here periodically as a submission, and may help answer your question: https://nsscds.org/wp-content/uploads/2018/05/Blueprint-for-Survival.pdf https://nsscds.org/wp-content/uploads/2018/05/Blueprint-for-... and the author (https://en.wikipedia.org/wiki/Sheck_Exley https://en.wikipedia.org/wiki/Sheck_Exley) died in a cave diving accident. To warn you, it is fairly disturbing.