This popular cave has some interesting stalactites and stalagmites, and traces of prehistoric habitation. The route gets quite steep in places. Visitors on a standard ticket will see about 1km of the 4km cave. Advance reservations and an additional ?1000 are required for the b¨ken k¨su (adventure course; ðꓥ³©`¥¹), where you get to don a helmet and overalls and follow a guide for a 90-minute exploration of the inner reaches of the cave. The adventure course is limited to Japanese-speakers.
There are five buses a day to ¸é²â¨±²µ²¹-»å¨ from Tosa-Yamada Station (?440, 20 minutes). Tosa-Yamada Station is 30 minutes from K¨chi by local train (?360), or 10 minutes by ³Ù´Ç°ì°ì²â¨± (limited-express train; ?1210).