Brandtaucher (German for Fire-diver) was a submersible designed by the German inventor and engineer Wilhelm Bauer and built by Schweffel & Howaldt in Kiel for Schleswig-Holstein's Flotilla (part of the Reichsflotte) in 1850. As built, Brandtaucher was 8.07 m long, 2.02 m at maximum beam and had 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 3 knots, but this could not be maintained for long periods of time.