Vietnams Mammoth Caves Dec 16, 2010 6:38:03 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Brian Roebuck on Dec 16, 2010 6:38:03 GMT -5 A giant cave column swagged in flowstone towers over explorers swimming through the depths of Hang Ken, one of 20 new caves discovered last year in Vietnam.ngm.nationalgeographic.com/2011/01/largest-cave/peter-photography