We’ve developed the ROV and 360 degree underwater camera system for Virtual Ocean Project
https://www.virtualocean.jp (in Japanese only)
https://www.atpress.ne.jp/news/189012 (in Japanese only)
https://drone-journal.impress.co.jp/docs/news/1182698.html (in Japanese only)
https://www.asahi.com/and_M/pressrelease/pre_4008808/ (in Japanese only)