Very interesting. It must be cool to own the entrance to a cave system as Mr. Shick does.
My best cave adventure? I'd say the visit I made to the Caverns of Sonora in Texas. If I recall correctly it was my first real foray underground and one of the things I least expected were the formations on the ceiling of the caverns which look exactly like bacon. Always amusing to see.
Image from: Caverns of Sonora Wikipedia
RE: Hiking in Kazamura Caves on Big Island, Hawaii