The diesel engine (also known as a compression-ignition or 'CI' engine) is an internal combustion engine in which ignition of the fuel that has been injected into the combustion chamber is initiated by the high temperature which a gas achieves when greatly compressed (adiabatic compression).
An electric motor is an electrical machine that converts electrical energy into mechanical energy.
The Kriegsmarine (War Navy) was the navy of Nazi Germany from 1935 to 1945.
The Royal Netherlands Navy (Koninklijke Marine, Royal Navy) is the navy of the Netherlands.
A ship class is a group of ships of a similar design.
New!!: O 21-class submarine and Ship class ·
A submarine is a watercraft capable of independent operation underwater.
New!!: O 21-class submarine and Submarine ·
A torpedo tube is a cylinder shaped device for launching torpedoes.