(SS-149: dp. 358 (n.) ; l. 150'4" ; b. 15'10" ; dr. 12'5" ; s. 14 k.; cpl. 25; a. 4 18" tt.; cl. H-l)

 H-6 (SS-149) was launched 26 August 1918 by Puget Sound Navy Yard; and commissioned there 9 September, Lt. Robert P. Lucker in command.

 As part of SubDiv 6 and later 7, H-6 was based at San Pedro, Calif. From there she operated along the West Coast, participating in various battle and training exercises with her sister submarines. Occasional patrol duty off Santa Catalina Island and overhauls at Mare Island varied this effective training routine.

 Departing San Pedro on 25 July 1922 with SubDivs 6 and 7, H-6 reached Norfolk on 14 September. She decommissioned there 23 October 1922. H-6 was struck from the Navy List 26 February 1931. She was sold for scrapping 28 November 1933.

USS H-6, a 358-ton H-4 class submarine, was commissioned in September 1918, the first of her class to be completed. She had originally been fabricated at Groton, Connecticut, for the Russian Navy, but the Russian revolution prevented delivery, and the disassembled "boat" was sold to the U.S. Government in May 1918. After completion by the Puget Sound Navy Yard, Bremerton, Washington, H-6 was based at San Pedro, California, for operations along the West Coast. Designated SS-149 in July 1920, she was transferred to Norfolk, Virginia, in the summer of 1922. Decommissioned in October of that year, USS H-6 was retained in reserve until February 1931, when she was stricken from the Navy List. She was sold for scrapping in late November 1933.