there was a point where a lot of water was coming out js for the record (tama hibiki [gem sounding] falls)

conclusion: speleology is hard. i still havent figured out what a limestone cave is. it could be commercial caves arent interesting.

the sign at the entrance said no photography but i js found a review that said they were told photography was allowed

on the other side of the roadway was the Ryūsen New Cave Science Museum, where photography was prohibited.
this was another cave, more academic.
https://maps.app.goo.gl/iqKCJSqWvxi4GLrD6

at the end, there was a way back up the stairs to the entrance. do not take video while climbing stairs

the passage was narrow but solid n there were several wheelchair users.

glad i hadnt received my iphone 15 yet i couldve dropped the phone.

seems most ppl visit to see such blue lakes.

seems it was ~15c (59f) near the entrance n ~10c (50f) at the back.

so ryusendo was full of exhibits with no scientific explanation, like this “cave venus.”

the second exhibit “the outline of ryusendo cave” and “bats of ryusendo cave.”

the first exhibition “the abyss of longevity.”

from the entrance to the first exhibition.
the floor was wet. it was cold.¹ the passage was narrow.

¹ the inside was 16 c (61 f) while the outside was 19 c (66 f).

so on sep 25, i went to Ryūsendō Cave in Iwaizumi, Iwate.
the street view below best describes the front of the entrance.
https://maps.app.goo.gl/Tq3y1aQog28oajESA