Seeteufel (Sea Devil) was a hand-powered submarine designed by Wilhelm Bauer in 1856.

After his last submarine, Brandtaucher had sunk, Bauer included a diver's chamber in the design.

Through this chamber, which worked like an airlock, divers could leave and enter the submerged vessel.

He had tried to obtain support for his invention in several countries, including the Austria-Hungary, the British Empire or France.

One such dive was undertaken in honor of the coronation of Alexander II on 6 September 1856, the national anthem of Russia was performed while the submarine was underwater.