Mercury used as ballast
German U-Boats are submarines. In World War 2, the Germans used these submarines to attack in groups of three or more. The Germans called these groups of submarines "wolfpacks". The Americans, British & Canadians also used the name "wolfpack" to refer to a group of German U-Boats.
Subs (Submarines).
U-boat
Introduced undersea warfare. They were used by the Germans to destroy British ships.
The Germans were the first to use Submarines in World War 1. Now i believe that the marines now do at times.
Yes, German submarines were very effective in both world wars. The Germans built excellent submarines and still do.
The Germans have used submarines in the Atlantic at various times in the past, including today. Atlantic submarine activity was a key theater of both World War I and World War II.
U boats- for Unterseabooten (under sea boats)
. Submarines
During WW2, all the major countries involved used submarines.
Yes, that is a German term. Non-Germans call them submarines.