by JSDunham » Dec 12, 2013 8:34 am
I've been to many caves in both NH and Maine. All those I've seen in NH are talus caves or fractures. Most of those I have visited in Maine are Sea Caves, and there are certainly dozens of those, albeit mostly small ones. There are some small solutional caves farther North in Maine; to my knowledge, there are none in NH.
There are definitely no 6-mile systems.