他带着自动潜水器练习着单人潜水，一个人在海中生存，在加利福尼亚的海岸上跳下。
He tested the free-diving self-propelled submersible — one of only two in existence at the time — on increasingly deep dives off the California coast.
他带着自动潜水器练习着单人潜水，一个人在海中生存，在加利福尼亚的海岸上跳下。
He tested the free-diving self-propelled submersible — one of only two in existence at the time — on increasingly deep dives off the California coast.
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