Entrance shaft, Hellhole. Photo Copyright, Paul Gillis.
	Virginia Big Ears (Plecotus townsendii virginianus) cluster as they hibernate in Hellhole. Note the large ears visible on the bats in the lower right of the frame. Photo Copyright, Craig Stihler.
Clustered Indiana bats (Myotis sodalis) . Photo Copyright, Craig Stihler.
	Bob's Big Break Borehole carves its way through the New Market limestone. The flat ceiling represents the bottom of the Lincolnshire, an erosion resistant limestone. Photo Copyright, Paul Gillis, 1997.
Surveyors pause to photograph borehole in 1996. Photo Copyright, Paul Gillis.
Bob Anderson works on the survey in Hellhole. Photo Copyright, Gordon Brace.	Hellhole contains a spectacular collection of rare cave formation types, including this basketball-sized anthodite cluster. Photo Copyright, Gordon Brace.
	Gordon Brace examines a drag-fold in the New Market limestone of Bob's Big Break Borehole. Photo Copyright, Paul Gillis.
Borehole passage in Hellhole's northern reaches. Photo Copyright, Edward Devine.
	A climber ascends the 155 foot Hellhole entrance drop. Photo Copyright, Edward Devine.
Hellhole's passages are typified by large trunk similar to this. Photo Copyright, Edward Devine.
	A caver surveys a suspended boulder in one Hellhole side passage. Photo Copyright, Edward Devine.