In 1963, a core drilling team was taking samples for I-35. ; 40 feet underground their drill bit broke into a massive air space, surprising the team when the drill bit then dropped to the ground in the air space....
So the skinniest guy on the team was lowered through a hole less than 3 ft in diameter, and found Innerspace Caverns, apparently the 4th largest cavern in Texas.
Usually around 72 degrees, 90% humidity. ; No tripods allowed, and portions of the cavern have flooded at times...and is also the home of prehistoric sinkholes - they have recovered the bones of many prehistoric animals here after they got trapped in the sinkhole, dropped into the cavern, pitch black, with no food.
[attachments posted prior to 4/27/2010 have been deleted by admin. be sure to link images to make sure they don't get removed]
So the skinniest guy on the team was lowered through a hole less than 3 ft in diameter, and found Innerspace Caverns, apparently the 4th largest cavern in Texas.
Usually around 72 degrees, 90% humidity. ; No tripods allowed, and portions of the cavern have flooded at times...and is also the home of prehistoric sinkholes - they have recovered the bones of many prehistoric animals here after they got trapped in the sinkhole, dropped into the cavern, pitch black, with no food.
[attachments posted prior to 4/27/2010 have been deleted by admin. be sure to link images to make sure they don't get removed]