olebat, Back in the early 1970s, my science teacher formed a mountaineering group, off we went to climb, hike, and slither thru caves. Still love the smell of wet limestone, the absolute darkness and cherish the perfect circle scar on my wrist from putting my arm up in front of the carbide lamp. Doubt I would fit through that stovepipe where I got stuck temporarily my first trip thru Onyx cave. Thanks for the memory.