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For diving there's small sealed tank inside, the negative tank.
为了下潜，里边还有个密封小水槽—负槽。
youdao
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The space between tank lid and tank body is water sealed with no air leaking.
箱盖和箱体之间采用水密封结构，无气体溢出。
youdao
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The space between tank lid and tank body is water sealed with no air leaking.
箱盖和箱体之间采用水密封结构，无气体溢出。
youdao