Mammoth Cave is now officially longer than 400 miles.
This official announcement is a bit old, as the survey work that brought Mammoth over 400 miles was probably done during the October or December 2012 expeditions.
Update: I contacted some of my caving friends who survey in Mammoth regularly, and they have confirmed that the survey reached 400 miles during the October 2012 expedition.
Wow! That’s amazing! When I was reading Roger Brucker’s books back in the 80′s, known areas of Mammoth Cave extended to only a fraction of that size.
His were among the most exciting books I’ve ever read, Thanks for sharing this news.
Never been to Mammoth, but I’ve visited Carlsbad Caverns (NM), which is great fun.