Som-class submarine
 For the modern submarines referred to as the Som class see Tango class submarine.The Som class were a series of submarines built for the Imperial Russian Navy in 1904-1907. They were designed by the Electric Boat Company and ordered in the 1904 emergency programme at the time of the Russo-Japanese War. The boats were designed to be transportable by train. The first boat Som was the former Fulton delivered to Russia in sections and re-assembled in St. Petersburg.