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|Length:||14.2 m (47 ft)|
|Beam:||c. 2 m (6 ft 7 in)|
|Draft:||2.9 m (9 ft 6 in)|
|Installed power:||80 hp (80 shp; 60 kW) gasoline engine|
|Test depth:||50 m (160 ft)|
|Armament:||2 torpedoes; 4 mines|
The Seeteufel was a response to the challenges that human torpedoes and small submarines faced during launch and recovery. The addition of tracks would grant the ability to more easily transfer from land to water and vice versa.
The prototype Seeteufel (a.k.a. "Elefant" or "Loedige Projekt") was developed in four months at the Kiel-Eckernförde torpedo testing center, under the direction of Alois Loedige. A two-man crew controlled the 14.2 m long submarine. An 80 hp gasoline engine provided propulsion on both water (at 10 kn) and land (at 10 km/h). When submerged, a 25 hp electric motor gave the vessel a cruising speed of 8 kn.
The submarine performed well in the water, but was considered underpowered on land. More powerful 250 hp diesel engines were planned for later models, in addition to wider tracks to spread the load and decrease ground pressure.
A series of Seeteufels were ordered at the Borgward factory in Bremen, but they were never constructed. The single experimental vessel was transferred to Lübeck and destroyed at the end of the war.