Modern submarines are built with an emphasis on stealth. Advanced propeller usage, novel use of insulation, and composites.
Also because of its stealth, can force an enemy navy to infer resources searching large areas of ocean and protecting ships against attack.
No but they use them for operational duties and they train their own pilots.
The USS Nautilus (SSN-571) was the world's first operational nuclear-powered submarine.
The USS Nautilus (SSN-571) was the world's first operational nuclear submarine.
It's a famous military submarine...
Turtle
Operational is something that is in use. Operational also mean ready for use.
Navy
David Bushnell .
MMOAS
Sortie
the Tank,submarine,and the helicopter.
That is David Bushnell's 'Turtle'