German Type 212 class, also Italian Todaro class, is a highly advanced design of non-nuclear submarine (U-Boat) developed by Howaldtswerke-Deutsche Werft AG (HDW) for the German Navy and Marina Militare. It features diesel propulsion and an additional air-independent propulsion.
Yasen class submarine , also known as the Severodvinsk class, is a new Russian nuclear multipurpose attack submarine class. The submarine is developed on the Akula-class submarine and the Alfa-class submarines and are projected to replace Russia's older Soviet-era class attack submarines both Akula class and Oscar class.
"Greenville" is the sixty ship of the Losangeles class submarine."Greenville" is in the Newport shipyard built second ships Losangeles class submarine. It is the Losangeles class submarine improved, enhanced navigation and icebreaking possibility.