The Sjöormen class were a group of submarines built for the Swedish Navy in the late 1960s.

Three boats were built, and equipped with communication facilities allowing them to operate as the command ships for groups of submarines.

These boats were designed in Yugoslavia and were the second group of indigenous submarines.

The Sutjeska class were a group of submarines built for the Yugoslav Navy in the late 1950s.

The Soviets respond with a group of submarines, also sent to the crisis zone.

Throughout the year the submarine conducted training maneuvers with a group of midget submarines.

The sub was a part of a large group of submarines which would support the Attack on Pearl Harbor.

The Archimede class were a group of submarines built for the Italian Navy in the early 1930s.

"The missile carries a very powerful warhead that enables it to operate against groups of warships and big submarines," he said.

The Sava class were the last group of submarines to be completed for the Yugoslav Navy.