This is the 10076th most frequent Japanese word.
進水
"Launch" or "christening" of a ship into water.
In this sentence, '進水' is used as a noun to signify the ceremonial or practical action of launching a ship into water for the first time.
新しい船が進水されました。
The new ship was launched.
Here, '進水' is used in the noun form to describe the event or moment when the ship is launched.
船は進水の瞬間に歓声が響きました。
Cheers echoed at the moment the ship was launched.
In this context, '進水させる' expresses the act of initiating the launch of a ship as a verb phrase.