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NavSource Online: Submarine Photo Archive


Patches 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, Portsmouth, N.H.; 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, 2 December 1968; 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.
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Sennet 45k The Sennet / A barracuda. Photo courtesy of sennet.org.
Sennet 788k Mrs. Roscoe W. Downs, sponsor, Rear Admiral Thomas Withers, USN, and Miss Eleanor Dzieman, maid of honor, at launching of Sennet (SS-408) at Navy Yard, Portsmouth, N.H., 6 June 1944. National Archives Identifier: 12562962
Photo courtesy of catalog.archives.gov
Photo added 05/27/17.
Sennet 634k On this day across the Atlantic the Allies stormed ashore on the beaches of Normandy, with ships going up the ways to deliver their troops; here we see the opposite as the Sennet (SS-408) slides down the launching ways at Portsmouth Navy Yard, Portsmouth, N.H., 6 June 1944. USN photo # 80-G-304564 from NARA, College Park, Maryland, courtesy of Sean Hert.
Sennet 407k Starboard side view of the Sennet (SS-408) as slides down the launching ways at Portsmouth Navy Yard, Portsmouth, N.H., 6 June 1944. Photo i.d. courtesy of Dave Johnston, (USNR).
USN photo courtesy of Scott Koen & ussnewyork.com.
Sennet 15k Commemorative post mark on the occasion of the Sennet's (SS-408) launching at Portsmouth Navy Yard, Portsmouth, N.H., 6 June 1944. Courtesy of petloveshack.com.
Threadfin 46k Commemorative launching tag of the Sennet (SS-408) at Portsmouth Navy Yard, Kittery, ME; 6 June 1944.Photo courtesy of Ron Toth, Jr. via Tom Kermen.
Sennet 588k Sennet (SS-408) was fitted out by 18 September. She held training exercises and torpedo tube testing off the coast of Connecticut and Rhode Island until 22 October.
These two views of Sennet were both taken on on 9 September 1944 from the airship ZP-11.
Text courtesy of DANFS
US National Archives photo # (insert 80G-280036), & 80G-280037 from NARA, College Park, Maryland, courtesy of Sean Hert.
Sennet 354k Sennet (SS-408) is seen here on 10 September 1944 as viewed from the airship ZP-11. US National Archives photo #80G-280046, from NARA, College Park, Maryland, courtesy of Sean Hert.
Sennet 107k Sennet's (SS-408) most profitable patrol was from 1 July to 9 August in the Sea of Japan. During the patrol, she sank one passenger-cargo ship, two cargo ships, and one tanker totaling 13,105 tons. On 30 July 1945, she sank the Yuzan Maru ex-Marne, 6,039 tons. Text courtesy of DANFS.
Photo courtesy of Robert Hurst via Joe Radigan.
Sennet 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 auxiliary 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.
Sennet 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.
Sennet 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.
Sennet 1.90k Sennet (SS-408), somewhere at sometime. US National Archives photo # wag282 26G-5058, from NARA, College Park, Maryland, courtesy of Sean Hert.
Sennet 25k From 10 December 1946 to 13 March 1947 Sennet (SS-408) participated in "Operation High-jump" the third Byrd Antarctic Expedition. Text courtesy of DANFS.
USN photo courtesy of Arctic Submarine Laboratory.
Sennet 1.23k Five photo PDF of the Sennet (SS-408) running on the surface in heavy seas. The Sennet is enroute to the Antarctic, as part of "Operation High-jump". US Navy and Marine Corps Museum/Naval Aviation Museum, Photo No.1986.056.001.072, courtesy of Mike Green.
Key West 1.41k Sennet (SS-408) way down South enroute to the Antarctic, as part of "Operation High-jump". Photo courtesy of Dan Wilmes, son of late R K Wilmes, MM3c, USS Dawn IX-186.
Sennet 55k 5 January 1947 - Ice damage to Sennet's (SS-408) bow can be clearly seen. USN photo National Archives(sb47a020). Photo & text courtesy of sennet.org.
Sennet 400k "Operation High-jump", 1946-47. Sennet (SS-408), three crew members repair an important bit of equipment, a U.S. Navy coffee pot. Left to right: Electrician's Mate Second Class C.M. Browning; Electrician's Mate First Class R.W. Rhymes; Fireman First Class P.A. Montaineri. Note the tattoos on Fireman Montaineri. USN photo # 80-G-703511, courtesy of the National Museum of the U.S. Navy, via flickr.com.
Sennet 27k Commemorative postal cover marking Sennet (SS-408) participation in "Operation High-jump" the third Byrd Antarctic Expedition. Photo courtesy of Jack Treutle.
Sennet 96k Several boats docked pier-side in 1948. From inboard to outboard:
Sennet (SS-408), Runner (SS-476), possibly the Cutlass (SS-478) inboard from the Sea Cat (SS-399).
Photo courtesy of John Hummel.
Sennet 147k Sennet (SS-408) in 1949. She operated from Balboa until 1949 when she was assigned to operate from Key West, Fla., as a unit of Submarine Squadron (SubRon) 12. The ship conducted training for submarine and antisubmarine personnel at Key West and Guantanamo Bay, Cuba. Text courtesy of DANFS.
Photo courtesy of John Hummel.
Key West 545k Amberjack (SS-522), Sennet (SS-408) & Manta (SS-299) moored to port side of Howard W. Gilmore (AS-16) at Naval Station Key West, Florida, January 1950. Photo # 80-G-428967 from NARA, College Park, Maryland, courtesy of Sean Hert.
Sennet 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. Text courtesy of DANFS.
Photo courtesy of subnet.com.
Sennet 85k Boats docked pier-side in 1952. From inboard to outboard:
Sennet (SS-408) & what looks to be Chivo (SS-341).
Photo courtesy of John Hummel.
Sennet 322k Sennet (SS-408) on 21 April 1952, probably off Key West, Florida. USN photo # USN 441453 USN Photo courtesy of Scott Koen & ussnewyork.com.
Halfbeak190kInboard Sennet (SS-408) & Halfbeak (SS-352) in Marseille, France,in 1954. Photo courtesy of John Hummel.
Balao & Sennet71k Balao (SS-285) & Sennet (SS-408) in Port Key West Fla, circa late 1950's. Photo courtesy of Jack Treutle.
Sennet 73k LCDR. Maurice Oscar Muncie commanded the Sennet (SS-408) from August 1959 to 1960. USN photo courtesy of Bill Gonyo.
Sennet 123k Sennet (SS-408) in color, 1960. Photo courtesy of John Hummel.
Corporal117kDarter (SS-576) & Corporal (SS-346) & Sennet (SS-408) outboard of Bushnell (AS-15) at Keywest Fla, 1960.Photo courtesy of John Hummel.
S 11 & 12 195k Left to right ex-Macabi (SS-375) as the Santa Fe (S-11), Sennet (SS-408) & ex-Lamprey (SS-372) as the Santiago Del Estero (S-12), 30 September, 1963. Photo courtesy of John Hummel.
Sennet 18k Commemorative postal cover marking the Sennet's (SS-408) arrival in Norfolk, Va., 18 September 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
Sennet (SS-408)
Ep-21 (1) - Victory At Sea ~ Full Fathom Five - HQ

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