Dwarf Nautilus

The great secret weapon of the Dwarf arsenal is the experimental Nautilus: a prototype submarine armed with deadly torpedoes. It is capable of sailing underwater for short distances, much to the consternation of the Dwarfs' enemies.

Dwarfs are known for their dislike of water, and are wary of sailing on normal surface ships so it is widely accepted that to join a Nautilus crew you must be mad. Suicidal young Sea Dwarfs, touched by tragedy, often volunteer for Nautilus duty as an alternative to a career as a Trollslayer. Casualties among Nautilus crews are high but there is no shortage of volunteers.

Torpedoes
The Nautilus is armed with the dreaded Dwarf clockwork torpedo: a spring-driven tube of copper with an explosive warhead capable of crippling any foes it hits. This is a lethal device and only slightly unreliable.

Source
Nautilus [[Category:N]]
 * Man O' War Rulebook
 * pg. 44
 * pg. 46