japan-diver:
Not as familiar with the northern caves but I thought the U/W cave in Okinawa (Onna area) was the largest in Japan? There is also an awesome cave in Kume-jima. Both of these caves are still being mapped and explored. Both are sea caves with entrances from the ocean. Numereous small caves have been found around the the larger one in Onna and many smaller ones have also been found up the coast of Okinawa. Exploration is quietly going on in many places in Japan.
What distance has Inamazumi been mapped to? Has it been full explored yet?
Hirobe-gama is the largest sea-cave in Japan.
That is not the largest U/W cave in Japan.
Total extension is 640m+.
I have known who cave discoverer for about ten years.
He discovered cave five years ago, and they had been surveyed cave for two years.
Hidenchi-gama is the second sea-cave in Japan.
Total extension is 410m+. :theyareon
The divers who explored Hidenchi-gama and Hirobe-gama were diving at Inazumi.
They are a little expecting the size of Inazumi.
Therefore, they say that it is the biggest sea cave in Japan.
No yet! :bonk:
Inazumi is not mapped, distance was measured only.
It is too big to survey Inazumi with a few divers.
I just dive over 1000m.