Brandtaucher

Brandtaucher on display at the Bundeswehr Military History Museum, Dresden
History
Germany
Name:	Brandtaucher
Builder:	Schweffel & Howaldt, Kiel
Launched:	1850
Fate:	Sank, 1 February 1851 Raised, 5 July 1887
Status:	Museum ship
General characteristics
Type:	Submarine
Length:	8.07 m (26.5 ft)
Beam:	2.02 m (6 ft 8 in)
Depth:	2.63 m (8 ft 8 in)
Propulsion:	Cranked propeller
Speed:	3 knots (5.6 km/h; 3.5 mph)
Test depth:	9.5 m (31 ft)
Complement:	3

Brandtaucher (German for Fire-diver) was a submersible designed by the Bavarian inventor and engineer Wilhelm Bauer and built by Schweffel & Howaldt in Kiel for Schleswig-Holstein's Flotilla (part of the Reichsflotte) in 1850.

In January 1850 Bauer, a cavalryman during the German-Danish War, designed Brandtaucher as a way to end the Danish naval blockade of Germany. Bauer's early sketch attracted the attention of the Minister of Marine, who allowed him to construct a 70 × 18 × 29 cm (27.6 × 7.1 × 11.4 in) model. The model was demonstrated in Kiel harbour in front of naval dignitaries. Its satisfactory performance led to the construction of a full-scale model, which was funded by contributions from army personnel and local civilians. Due to the inadequate funding, the scale of the boat had to be downgraded and the design altered and simplified; resulting in a reduced diving depth from 30 m to 9.5 m. This redesign included eliminating the use of enclosed ballast tanks to contain the water being taken into and expelled from the submarine. Instead, the water was allowed to pool inside the bottom of the hull, below the main floor, and was able to move relatively unobstructed within this area when the ship changed orientation. The resulting instability was probably a significant contributing factor to the loss of the vessel.

As built, Brandtaucher was 8.07 m long and 2.02 m at maximum beam, with a draught of 2.63 m. It was propelled by a crew of three turning large tread wheels connected to a propeller. The boat could reach a speed of three knots, but this could not be maintained for long periods of time.

On 1 February 1851, Brandtaucher sank after a diving accident during acceptance trials in Kiel Harbour. The submarine experienced equipment failure, and sank to the bottom of a 60-foot hole at the bottom of Kiel Harbour. Bauer escaped by letting in water, thus increasing the air pressure, which allowed Bauer and his two companions to open the hatch and swim to the surface. This was the first submarine escape to be witnessed and reported.