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動画見つけました。社名はSublueですね。意外にちゃんと動いてる。

https://www.youtube.com/watch?v=wk2qXUzwdA4

Chinese company, Tianjin Sublue Ocean Science Technology, has developed an underwater drone that can operate up to 75 metres deep, and can film in high definition. They are hoping to become the DJI of underwater drones.