Comment by BuildTheRobots

I've just realised that the word document linked to actually seems to be dated 1974 (google makes it seem possible that the incident was 1971). It doesn't excuse anything but I like to think we've gotten a bit better since then. I get the impression in caving circles at least, "bad air" is much better understood these days.

(irrelevant, but for the record, cave diving scares the pants off've me =) )