下潜

The diver went into the deep water beyond the danger limit.

潜水员下潜到超过危险线的深水中去了。

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。

Submarine can submerge very quickly.

潜水艇的下潜速度非常快。

Thomas Hudson wondered why the fish had stopped when he had gone so deep.

托马斯·赫德森弄不清楚，刚才那条鱼既然已经下潜到那么深了，怎么又突然之间停下来了。

If he wants to go deeper he must lose some of this freedom.

要是他想下潜得更深，行动就要受到限制。