People are just assuming this is true, but has this possibility ever truly been researched? Isn't it possible that the level of methane might be too high for this to be a safe alternative? Before I took a donkey into the cave with me, I would want to be sure it will work. I searched the DAN web site and I looked through Rubicon, but I cannot find a single authoritative study.
I suggest some brave soul, perhaps Bob since it was his idea, initiate a study. I am sure grant funds will be available somewhere.
I'll kick in but I would expect the study to be conducted using the latest high def video and surround sound recording equipment.