Som Class.

(Completed 1904–6.)

These two vessels, which are of the Holland-Bubnoff type, have a submerged displacement of about 150 tons. Petrol and electric motors are used for surface and submerged propulsion, and the speed is 9 ½ knots and 7 knots, above and below, respectively. Their armament consists of two bow tubes with four 18-inch Whitehead torpedoes. Their complement is about fifteen officers and men.