Trapped in a pocket of air, they had only 40 minutes before the tide flooded the chamber.

他们被困在有一点空气的弹丸之地，再过40分钟洪水就会淹没这间屋子了。

《柯林斯英汉双解大词典》

It must have hit an air pocket.

一定是遇到了一个气潭。

youdao

You even may take him to make the air pocket, you may say arrogantly: I do not love you!

你甚至可以拿他来做出气袋，你更可以骄傲地说：我不爱你！

youdao