submarines
n. countable B1 Intermediate US //ˈsəbmɝˌinz// UK //sˈʌbməɹˌiːnz// sub·marines
n. ships that can travel and stay deep under the water. They are often used by the military or for scientific research in the ocean.
n. vessels capable of independent operation underwater. Refers to watercraft that use ballast tanks to submerge and surface.
The submarines dive deep into the ocean.
Military submarines can remain submerged for months at a time without needing to surface for air.
Advanced nuclear-powered submarines represent a significant leap in naval engineering, allowing for nearly silent propulsion and indefinite underwater endurance limited only by the crew's food supplies.
Usage
The plural form of 'submarine'.