Submerged

Readying the patrol
Defying the surface fleet
Invisible and deadly
Submerged killer of the seas

Rapid predator
Counter the dreadnoughts
Merchant ships in danger
Minelayers on duty

Resolution to fulfill
The task lies ahead
Submerged, ready to attack
Sink and eliminate

Surface attack
Unrestricted mandate
Avoiding depth charges
Getting closer to obliterate

Code breaking
Danger from above
Strike the convoys
Blow them up

Resolution to fulfill
The task lies ahead
Submerged, ready to attack
Sink and eliminate

Facing acute shortage
Supplies are running out
A vicious task
Thousands of ships were sunk