A speed of at least around 30 knots would be necessary for keeping up with Navy carrier strike groups. The Italian Navy's ...

The Problem: The U.S. Navy operates just three Seawolf-class submarines, known for their advanced capabilities, including speeds of 35 knots submerged and a robust armament capacity. However ...

They can operate in heavy seas and winds of 45 knots, but for other than heavy-weather training, the Navy limits its use to somewhat milder sea conditions (wind speed is less than 34 knots).