Submarine Sennet (SS-408)

Sennet

Country	United States
Ship Class	Balao-class Submarine
Hull Number	SS-408
Builder	Portsmouth Naval Shipyard, Kittery, Maine, United States
Laid Down	8 Mar 1944
Launched	6 Jun 1944
Commissioned	22 Aug 1944
Decommissioned	2 Dec 1968
Displacement	1,550 tons standard; 2,440 tons submerged
Length	312 feet
Beam	27 feet
Draft	17 feet
Machinery	Four Fairbanks-Morse Model 38D8-? 10-cylinder diesel engines (5,400shp), two low-speed direct-drive Elliott electric motors (2,740shp), two 126-cell Sargo batteries, two propellers
Speed	20 knots
Range	11,000nm at 10 knots surfaced, 48 hours at 2 knots submerged
Crew	80
Armament	6x533mm forward torpedo tubes, 4x533mm aft torpedo tubes, 24 torpedoes, 2x130mm gun, 2x40mm Bofors gun, 3x .50cal machine guns
Submerged Speed	8.75 knots

Contributor: C. Peter Chen

ww2dbaseSubmarine USS Sennet was commissioned into service in mid-1944 and embarked on her first war patrol against Japan in Jan 1945. Of her four patrols in the Pacific War, the fourth was the most effective, during which she sank three cargo ships and one tanker in the Sea of Japan. After the war, she was assigned to the Atlantic Fleet, basing first out of New London, Connecticut, United States and then out of Balboa, Panama Canal Zone. In late 1946 and early 1947, she participated in Operation Highjump, an Antarctic expedition which saw the first use of basic under-ice SONAR equipment, which was installed aboard USS Sennet. In 1949, her base was moved to Key West, Florida, United States. In 1951, she was converted to a fleet snorkel submarine at the Philadelphia Naval Shipyard in Pennsylvania, United States. In the 1950s and 1960s, she mainly conducted training operations on the east coast of the United States. She was sold for scrapping in 1973 aftering being found unfit for service.

ww2dbaseSource: Wikipedia

Last Major Revision: May 2012

Submarine Sennet (SS-408) Interactive Map

Photographs

USS Sennet off the Panama Canal Zone, Jun 1946

USS Sennet in Antarctica during Operation Highjump, Dec 1946-Mar 1947

USS Sennet in Antarctica during Operation Highjump, 5 Jan 1947; note ice damage to the bow

USS Sennet underway off Key West, Florida, United States, 21 Apr 1952

Sennet Operational Timeline

8 Mar 1944	The keel of submarine Sennet was laid down at Portsmouth Naval Shipyard, Kittery, Maine, United States.
6 Jun 1944	Submarine Sennet was launched at Portsmouth Naval Shipyard, Kittery, Maine, United States, sponsored by the wife of Roscoe W. Downs.
22 Aug 1944	USS Sennet was commissioned into service with Commander George E. Porter in command.
18 Sep 1944	USS Sennet completed her fitting out.
22 Oct 1944	USS Sennet completed her training exercises off Connecticut and Rhode Island, United States.
11 Nov 1944	USS Sennet departed northeastern United States for the Panama Canal Zone.
29 Nov 1944	USS Sennet departed Balboa, Panama Canal Zone.
16 Dec 1944	USS Sennet arrived at Pearl Harbor, US Territory of Hawaii.
5 Jan 1945	USS Sennet departed Pearl Harbor, US Territory of Hawaii for her first war patrol.
9 Jan 1945	USS Sennet received minor repairs at Pearl Harbor Navy Yard, US Territory of Hawaii.
21 Jan 1945	USS Sennet attacked a Japanese tanker off the Bonin Islands; all 8 torpedoes missed.
22 Jan 1945	USS Sennet attacked a Japanese patrol boat off the Bonin Islands; the single torpedo missed.
23 Jan 1945	USS Sennet attacked Japanese patrol boats off the Bonin Islands, sinking one and damaging another with 1 of 6 torpedoes fired.
26 Jan 1945	USS Sennet attacked a Japanese patrol boat off the Bonin Islands; the single torpedo missed.
28 Jan 1945	USS Sennet departed the Bonin Islands area.
31 Jan 1945	USS Sennet arrived at Saipan, Mariana Islands, ending her first war patrol.
7 Feb 1945	USS Sennet departed Saipan, Mariana Islands for her second war patrol.
13 Feb 1945	USS Sennet shared the credit of sinking two Japanese patrol boats with USS Haddock and USS Lagarto south of Japan.
14 Feb 1945	USS Sennet damaged a Japanese patrol boat with her deck gun south of Japan.
16 Feb 1945	USS Sennet sank Japanese minelayer Nariu south of Japan, hitting her with 2 of 3 torpedoes fired.
9 Mar 1945	USS Sennet arrived at Guam, Mariana Islands, ending her second war patrol.
2 Apr 1945	USS Sennet completed refitting from USS Apollo at Guam, Mariana Islands.
3 Apr 1945	USS Sennet departed Guam, Mariana Islands for her third war patrol.
13 Apr 1945	USS Sennet attacked a Japanese patrol boat south of Japan; the single torpedo missed.
14 Apr 1945	USS Sennet attacked a Japanese patrol boat south of Japan; the single torpedo missed.
16 Apr 1945	USS Sennet was attacked by Japanese patrol boats off Miki Saki, Mie Prefecture, Japan.
19 Apr 1945	USS Sennet sank Japanese cargo ship Hagane Maru and an escorting vessel south of Japan, hitting them with 2 of 3 torpedoes fired.
22 Apr 1945	USS Sennet searched for a P-51 fighter pilot who had bailed out near her position south of Japan, but would fail to locate the pilot.
28 Apr 1945	USS Sennet sank Japanese repair ship Hatsushima south of Japan, hitting her with 2 of 3 torpedoes fired.
1 May 1945	USS Sennet attacked a Japanese destroyer off Japan; all six torpedoes missed.
16 May 1945	USS Sennet arrived at Pearl Harbor, US Territory of Hawaii, ending her third war patrol.
1 Jul 1945	USS Sennet began her fourth war patrol in the Sea of Japan.
28 Jul 1945	USS Sennet attacked a Japanese convoy in the Sea of Japan, sinking three ships, hitting them with 6 of 12 torpedoes fired.
29 Jul 1945	USS Sennet attacked a Japanese transport in the Sea of Japan; the single torpedo missed.
30 Jul 1945	USS Sennet sank a Japanese transport in the Sea of Japan, hitting her with 2 of 3 torpedoes fired.
31 Jul 1945	USS Sennet attacked a Japanese patrol boat in the Sea of Japan; all 3 torpedoes missed.
9 Aug 1945	USS Sennet ended her fuorth war patrol.
10 Dec 1946	USS Sennet began her participation in the Operation Highjump Antarctic expedition.
13 Mar 1947	USS Sennet completed her participated in the Operation Highjump Antarctic expedition.
3 May 1952	Commander Julius Schocken was named the commanding officer of USS Sennet.
6 Jul 1954	Lieutenant Robert Netting was named the commanding officer of USS Sennet.
4 Nov 1954	USS Sennet departed Key West, Florida, United States for a tour in the Mediterranean Sea.
30 Jan 1955	USS Sennet returned to the United States from a tour of duty in the Mediterranean Sea.
1 Aug 1959	USS Sennet's home port was shifted to Charleston, South Carolina, United States.
2 Dec 1968	USS Sennet was decommissioned from service and was struck from the US Naval Register.
18 May 1973	Submarine Sennet was sold to Southern Scrap Material Company, Limited of New Orleans, Louisiana, United States for US$103,889.
15 Jun 1973	The Southern Scrap Material Company, Limited began scrapping submarine Sennet.

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