This shot, along with a few others, are published in the SRC, Speleological Research Council paper, see p.13 The Exploration and Speleogeography of Mammoth Cave, Jenolan by John Dunkley and Edward Anderson 1971 ISBN 0 9599622 0 4 Jenolan, J41, 29th Feb 1st March 1964. Similar to the Gunbarrel passage.. See p17 suss.caves.org.au/bulletins/bulls/v5160/bull_52-1.pdf#page17 See p79 Red Album Now we have SUSS on Instagram, one can find shots here like this... instagram.com/p/BWUqzB4jerX/