B1 noun /ˈsʌb.mə.riːn/
Sub-marine
подводная лодка
Meaning
a warship with a streamlined hull designed to operate completely submerged in the sea
Example
The submarine dived deep into the ocean to avoid detection.
Субмарина нырнула глубоко в океан, чтобы избежать обнаружения.