The "Marine-Fliegerabteilung" consisted of Zeppelins (airships), observation balloons and fixed-wing aircraft. It is unlike both the original Zeppelins that had a rigid skeleton and non-rigid blimps. The city was bombed by German heavy Gotha bombers and by Zeppelins. Falling bombs, shrapnel, anti-aircraft fire and the droning of Zeppelins were ever threatening. Enemies include zombie snipers, zeppelins and lava monsters. Pilots were permitted to deploy them against only zeppelins and balloons. The station was responsible for defending the capital against attacks by Zeppelins and Gotha bombers. Tracers proved useful as a countermeasure against Zeppelins used by Germany during World War I. During the war the Navy Zeppelins were mainly used in reconnaissance missions. Elektron has been used in aircraft, Zeppelins, and motor racing applications. The two "Graf Zeppelins" were scrapped in early 1940. Players can also use boats, zeppelins, or portals to move from one continent to another. It has been proposed that modern zeppelins could be powered by hydrogen fuel cells. Another false ending precedes footage of zeppelins and tightrope walkers. Italy and France made limited use of Zeppelins handed over as war reparations.