dolphins ,bats, and submarines all have echo location
A flower in German is called "Blume".
"snakes" are called "Schlangen" in German.
"Father" is called "Vater" in German.
They where U-boats or Underwater Boats. These ships sunks most likely the most ships in the entire war.
Submarines use the ultra sound in sonar in order to find any hurdles in their path as visibility is very less under water.
"They are called" translates into German as "sie heißen".
A group of German submarines is called a Wolfpak.
The German airforce was called the Luftwaffe.
The leader of the German government is called the Bundeskanzler.The German head of state is called the Bundespräsident.
In German it is called Schweiz.
german U-boats were submarines. in German they are called Unterseeboot