This is the 8978th most frequent Japanese word.
沈船
Sunken ship.
沈船 is used as the target of a salvaging operation.
沈船の引き揚げ作業が進行中です。
The operation to salvage the sunken ship is underway.
Here, 沈船 refers to a ship that has sunken and is lying underwater.
沈船は海底に眠っている。
The sunken ship lies on the ocean floor.
In this sentence, 沈船 specifically describes the object of exploration by divers.