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 bōken kōsu (adventure course; 冒険コース), 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 搁测ū驳补-诲ō from Tosa-Yamada Station (?440, 20 minutes). Tosa-Yamada Station is 30 minutes from Kōchi by local train (?360), or 10 minutes by 迟辞办办测ū (limited-express train; ?1210).