If you look closely at the floor of the sinkhole, there are two
parallel lines running across the sinkole
http://www.astroengine.com/wp-content/uploads/2009/03/hirise_esp_011386_2065_cut-250x250.jpg
My best guess is the former cavers that were there rigged tyroleans,
using one for filming. And due to lack of
time or oxygen, they had to leave the pit rigged.
If you download that image and zoom in, you can see the ropes are
clearly above the floor of the cave, maybe
by at least 100 feet.
David Locklear
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