The Soviet Union moved to regain status as operator of the world's largest submarine fleet. Over the following eight years, they built 235 Whiskey class submarines using the Type XXI as a template.

After the war, the allies took the remaining Type XXI U-boats and used them to developed their own submarine technology. The Type XXI design inspired the Soviet Union Whiskey-class and the U.S ...

EXCLUSIVE: When Whiskey-class Soviet submarine U137 ran aground in Sweden in 1981 it sparked a diplomatic fracas that threatened to ignite a global conflict. With nukes possibly in play ...