underwater

Marine biologists used a specialized submarine to film the strange creatures living in the deep underwater trenches.

(Chinese) 海洋生物学家使用专门的潜艇来拍摄生活在深海沟里的奇异生物。

The ancient city of Heracleion was discovered by archaeologists after being underwater for over a thousand years.

(Chinese) 赫拉克利翁古城在被淹没于水下千年之后被考古学家发现。