海底

the bottom of the sea; seabed; sea floor

~采矿 undersea mining; offshore mining~电报 submarine telegraph; cablegram~电缆 submarine cable~勘察 submarine exploration~矿 submarine mine~山 seamount~水雷 ground mine (or torpedo)~峡谷 submarine canyon~油田 offshore oilfield~资源 seabed resources; submarine resources