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NavSource Online: Submarine Photo Archive

Patch contributed by Mike Smolinski

Sennet (SS-408)

Radio Call Sign: November - Kilo - Papa - Tango

Balao Class Submarine: Laid down, 8 March 1944, at Portsmouth Navy Yard, Kittery, ME.; Launched, 6 June 1944; Commissioned USS Sennet (SS-408), 22 August 1944; Converted to a Fleet Snorkel Submarine at Philadelphia Naval Shipyard in 1952; Decommissioned, and Struck from the Naval Register, 15 June 1973; Final Disposition, sold for scrapping, 15 June 1973, to Southern Scrap Material Co. Ltd., New Orleans, LA. for $ 103.889.00. Sennet earned four battle stars during WWII.
Partial data submitted by Ron Reeves, HTC, USNR (ret.)

Specifications: Displacement, Surfaced 1,526 t., Submerged 2,391 t.; Length 311' 8"; Beam 27' 3"; Draft 15' 3"; Speed, Surfaced 20.25 kts, Submerged 8.75 kts; Cruising Range, 11,000 miles surfaced at 10 kts; Submerged Endurance, 48 hours at 2 kts; Operating Depth, 400 ft; Complement 6 Officers 60 Enlisted; Armament, ten 21" torpedo tubes, six forward, four aft, 24 torpedoes, one 5"/25 deck gun, one single 40mm gun mount, one single 20mm gun mount, two .50 cal. machine guns; Patrol Endurance 75 days; Propulsion, diesel-electric reduction gear, Fairbanks Morse diesel engines, 5,400 HP, Fuel Capacity, 116,000 gal., four Elliot Motor Co. electric main motors with 2,740 shp, two 126-cell main storage batteries, two propellers.

Size	Image Description	Source
15k	Commemorative post mark on the occasion of the Sennet's (SS-408) launching at Portsmouth Navy Yard, Kittery, ME., 6 June 1944.	Courtesy of petloveshack.com.
90k	Sennet (SS-408), port side view, circa 1944-45. Heavy gun batteries were of somewhat limited value because they lacked fire controls. The next step then, was to add a surface-ship type fire control system: an Mk 6 stable element, and an Mk 6 computer driving gun-order repeaters at the guns. The most striking change was internal: a gun plot was installed in the forward crew quarters. She also had a pair of single 40 mm guns. Note too that the usual wartime SD air warning radar had been replaced by the big antenna of the late war SV, on the auxillary mast abaft the periscope shears and conning tower.	Photo courtesy of John Hummel. Text courtesy of U.S. Submarines Through 1945, An Illustrated Design History by Norman Friedman. Naval Institute Press.
30k	Sennet (SS-408) and others on patrol sometime around the period of June 1946, when she was reassigned to Submarine Squadron 6 at Balboa, C.Z.	USN photo courtesy of navweaps.com.
90k	This photo of Sennet (SS-408) is probably around the period of June 1946, when she was reassigned to Submarine Squadron 6 at Balboa, C.Z.	USN photo, text courtesy of DANFS.
25k	From 10 December 1946 to 13 March 1947, Sennet (SS-408) participated in "Operation Highjump" the third Byrd Antarctic Expedition.	USN photo courtesy of Artic Submarine Laboratory, text courtesy of DANFS.
50k	From 10 December 1946 to 13 March 1947, Sennet (SS-408) participated in "Operation Highjump" the third Byrd Antarctic Expedition. However, she was not considerd a suitable ship for ice operations. Note that one of her periscopes is fully extended.	USN photo from "The American Submarine" by Norman Polmar, courtesy of Robert Hurst. Partial text courtesy of DANFS. Photo added 11/04/07.
27k	Commemorative postal cover marking Sennet (SS-408) participation in "Operation Highjump" the third Byrd Antarctic Expedition.	Photo courtesy of Jack Treutle.
56k	In 1951 Sennet (SS-408) was converted to a fleet snorkel submarine at the Philadelphia Naval Shipyard. She appears here sometime after that conversion.	Photo courtesy of subnet.com., text courtesy of DANFS.
71k	Balao (SS-285) & Sennet (SS-408) in Port Key West Fla, circa late 1950's.	Photo courtesy of Jack Treutle.
18k	Commemorative postal cover marking the Sennet's (SS-408) arrivial in Norfolk, Va., 18 Sept. 1965.	Photo courtesy of Jack Treutle.

View the Sennet (SS-408)
DANFS history entry located on the Haze Gray & Underway Web Site.

Crew Contact And Reunion Information
U.S. Navy Memorial Foundation
Fleet Reserve Association

Additional Resources and Web Sites of Interest
Full Fathom Five, U.S. Submarine War Against Japan

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