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1,475 Tons (standard)
2,370 Tons (submerged)
307' 2" x 27' 3" x 14' 7.5"
10 x 21" Torpedo Tubes
(6 fwd, 4 aft) with 24 torpedoes
3" deck gun
Built by Electric Boat Company in Groton, Connecticut. Laid down April 3, 1940 as a Tambor-class submarine. Launched January 31, 1941 as USS Grayback (SS-208). Commissioned June 30, 1941 in the U.S. Navy (USN) with Lieutenant Willard A. Saunders in command and attached to the Atlantic Fleet.
Grayback conducted her shakedown cruise in the Long Island Sound operating from Newport, New London, and New York. On September 8, 1941 departed New London with USS Grampus (SS-207) for patrol duty in the Caribbean Sea and Chesapeake Bay and then arrived at Portsmouth on November 30, 1941 for overhaul. Afterwards, departed bound for the Pacific and transited the Panama Canal then proceeded to Pearl Harbor arriving February 8, 1942.
On February 15, 1942 departs Pearl Harbor on her first war patrol off Saipan and Guam. There she had a four-day encounter with an enemy submarine; the enemy I-boat fired two torpedoes at Grayback on the morning of February 22, then continued to trail her across the Pacific. Grayback spotted the enemy conning tower a couple of times, and the Japanese ship broached once; but the Grayback could not get into position to attack. After four days, Grayback shook the enemy sub and continued on patrol. On March 17 she sank her first ship, a 3291-ton cargo ship off Port Lloyd then returned to Pearl Harbor on April 10, 1942 ending the patrol.
On May 4, 1942 departs Pearl Harbor on her second war patrol with air cover and USS Grayson (DD-435) then proceeds alone into the central Pacific. On May 13, 1942 at dawn passed within 145 miles of Makin Island. On May 16, 1942 arrives Ocean Island and made no sightings. During this patrol, Grayback found no targets and even patrols on the surface during the day. On June 22, 1942 arrived to Fremantle ending the patrol.
Third War Patrol
On June 22, 1942 departed Fremantle on her third war patrol and proceeded to the Lombok Strait. On July 21, 1942 passed Lombok Island and the next day spotted two small fishing boats. On July 24, 1942 entered Makassar Strait and at 7:30pm fired on by a small patrol boat and made a deep dive expecting a depth charge attach and was chased until 10:10pm. On July 25, 1942 at 1:25am surfaced and cleared the area. On July 26, 1942 spotted small Maru on a parallel corse and attempted to get into an attack position. On July 27, 1942 entered the Celebes Sea. On July 30, 1942 entered the Balabac Strait bound for the South China Sea then returned via the same route. On September 3, 1942 returned to Fremantle ending the patrol. Afterwards, back to Pearl Harbor for an overhaul with SJ radar installed, de-gaussing cable reinstalled and sound tested with four days of training activities.
Fourth War Patrol
On October 19, 1942 departed Pearl Harbor under the command of LtCdr John E. Lee on her fourth war patrol escorted by USS Boggs and for the next three days made dive tests and drills while proceeding westward. On October 23, 1942 roughly 600 miles east of Wotje when the submarine made a radar contact and submerged. On October 24, 1942 directed to patrol off Buka Passage but four days later instead ordered to patrol off Truk.
On October 29, sighted an unidentified plane and submerged then surfaced and received a near miss from a a bomb or depth charge. At 2:29 spotted three ships including two tankers and a destroyer. Fired torpedoes at the rear tanker but missed because it turned and was again depth charged by an aircraft. Afterwards, dove as the destroyer made several depth charge attacks over two hours but all exploded astern and departed by 5:00pm.
On October 31, 1942 began patrolling off Otta Pass south of Truk. On November 3, 1942 at 4:15am spotted a freighter and attempted to attack but was unable to get close enough. At 12:31pm while submerged at 100' three depth charges exploded in the vicinity. On November 5, 1942 again depth charged and evaded patrol boats. On November 6, 1942 spots a Chiyoda type seaplane tender and fires three torpedoes claiming two hits, but fails to score any. Afterwards, attached by a E8N2 Dave floatplane that drops 3 x 60kg depth charges that caused minor damage. On December 13, 1943 ended the patrol at Fremantle.
Departed Australia on December 7, 1942. A week later, Pharmacist's Mate Harry B. Roby was called upon to perform an emergency appendectomy, the second to be done on a patrolling submarine. With Grayback running a hundred feet beneath the surface, the untutored Roby successfully removed the infected appendix, and his patient was back standing watch by the end of the patrol. On December 25, Grayback surfaced to sink four landing barges with her deck guns. Four days later she was again fired on by an enemy submarine but maneuvered to avoid the torpedoes. On January 3, 1943 sunk I-18, one of 25 Japanese submarines destroyed by western submarines during the war.
On January 5, 1943 Grayback served as beacon ship for the shore bombardment of Munda and during the early morning she received word that six crew from B-26B "Queenie" 41-17586 shot down two days earlier were awaiting rescue on Rendova Island. Grayback sent ashore two men, then submerged at dawn to avoid enemy aircraft. The submariners found the aviators, three of whom were injured, and together continued to hide in the jungle. As night fell, Grayback surfaced offshore and by coded light signals directed the small boat back to the submarine. For this action skipper Edward C. Stephan earned the Navy Cross and U.S. Army Silver Star.
Grayback continued on patrol, torpedoing and damaging several Japanese ships. On January 17 she attacked a destroyer escorting a large transport, hoping to disable the escort and then sink the freighter with her deck guns. However, the destroyer evaded the torpedoes and released 19 depth charges on the submarine. One blew a gasket on a manhole cover and caused a serious leak and returned to Brisbane arriving February 23, 1943.
Departed February 16, 1943 to patrol the Bismarck Sea and Solomon Sea without any success. Her SJ radar had failed to function; and although she had taken several shots at cargo ships, none were sunk. Returned on April 4, 1943.
On April 25, 1943 departs Brisbane on her seventh war partol. On May 11, 1943 Grayback received a radio message from USS Albacore (SS-218) with the location of a enemy convoy. Surfacing at night, Grayback fired a spread of six torpedoes at seven freighters and three escorts. The three escorts charged and she had to dive deep to elude their attacks and was credited with sinking Yodogawa Maru. On May 16, 1943 torpedoes and seriously damages Destroyer Yugiri northwest of Kavieng near Mussau Island at Lat 1°00'S, Long 148°44'W. The next day Grayback intercepted four transports with one escort and sank England Maru and damaged two others before she was forced to dive. On May 30, returned to Pearl Harbor ending the patrol then proceeded to San Francisco for overhaul.
On September 12, 1943 returned to Pearl Harbor on under the command of Commander John Anderson Moore. On September 26, 1943 departed on her eighth war patrol with USS Shad (SS-235) and rendezvoused with USS Cero (SS-225) at Midway to form the first U.S. Navy submarine wolfpack. The three submarines under the command of Captain Momsen aboard Cero, searched the China Sea and returned to base with claims of 38,000 tons sunk and 3300 damaged. Grayback accounted for two ships, a passenger-cargo vessel torpedoed 14 October and a former light cruiser, Awata Maru, torpedoed after an end-around run on a fast convoy October 22. The submarines had expended all torpedoes and on November 10, 1943 returned to Midway. Afterwards, CO Commander John Anderson Moore earned thee Navy Cross with the citation published in the Bureau of Naval Personnel Information Bulletin No. 329 (August 1944).
Departed Pearl Harbor on December 2, 1943 for the East China Sea. Within five days of her first contact with Japanese ships, she had expended all her torpedoes in a series of attacks which netted four ships for a total of over 10,000 tons. On December 16, 1943 at 10:19pm attacks convoy of four freighters and three escorts and fired four torpedoes at the second and third ships in the convoy and hits and sinks Gyokurei Maru. On December 19, 1943 surfaces to continue attacking the convoy but SJ radar spots a target closing fast and crash dives and turns firing her four stern torpedoes with at least three hitting and sinking Numakaze.
Two nights later, 20 December to 21 December, she spotted another convoy of six ships; and, after an end-around run she fired a spread of nine torpedoes into the heart of the Japanese formation. This first attack sunk one freighter and damaged another before Grayback dived to elude depth charges. Three hours later she surfaced and sank a second freighter. After an unsuccessful attack the following night had exhausted her torpedo supply, Grayback headed home. The submarine surfaced 27 December and sank a fishing boat with deck guns before returning to Pearl Harbor on January 4, 1944.
Afterwards, CO Commander John Anderson Moore earned the a second Navy Cross (Navy Cross with gold star) for his actions with the citation published in the Bureau of Naval Personnel Information Bulletin No. 330 (September 1944). Grayback has been awarded the Navy Unit Commendation for the period of her last four patrols (Sixth Patrol to Ninth Patrol when lost).
On January 28, 1944 departed Pearl Harbor on her tenth war patrol bound for the East China Sea. On February 19, 1944 Grayback sunk two cargo ships Taikei Maru and Toshin Maru plus damaged two others. On February 25, 1944 transmitted her second and final report about the sinking of tanker Nanho Maru and severe damage to Asama Maru. With only two torpedoes remaining, she was ordered back from patrol.
On February 27, 1944 Grayback fired her last two torpedoes sinking Ceylon Maru. Afterwards, spotted on the surface by a B5N Kate and bombed scoring a hit and "exploded and sank immediately" at roughly Lat 25° 47' N Long 128° 45'E, into the East China Sea to the south of Okinawa. Also, anti-submarine ships dropped depth charges on a trail of air bubbles and observed an oil slick that swelled to the surface of the South China Sea.
On March 7, 1944 when Grayback did not arrive when due at Midway. On March 30, 1944 ComSubPac listed her as missing and presumed lost with all hands. Grayson CO, John Anderson Moore was posthumously awarded after this mission by third Navy Cross during March 1945.
Grayback ranked 20th among all submarines in total tonnage sunk with 63,835 tons and 24th in total number of ships sunk with 14 sinkings to her credit. The submarine and crew earned two Navy Unit Commendations for their seventh, eighth, ninth, and tenth war patrols. Grayback received eight battle stars for World War II service.
On June 5, 2019 the wreck of the Grayback was discovered upright on the bottom at a depth of 1,400' / 426.72m by Lost 52 Project led by Tim Taylor. The submarine had severe damage aft of the coning tower from the bomb impact. On November 10, 2019 the discovery was reported in the media.
The entire crew was officially declared dead January 12, 1946. All earned the Purple Heart, posthumously. All remain listed as Missing In Action (MIA) and are memorialized at Manila American Cemetery on the tablets of the missing.
Commander John Anderson Moore was posthumously earned a third Navy Cross (Navy Cross with 2 Gold Stars with the citation published in the Bureau of Naval Personnel Information Bulletin No. 336 (March 1945).
At Heslar Naval Armory in Indianapolis, Indiana is a memorial to USS Grayback with a bronze plaque and a torpedo established by the Submarine Veterans of W.W.II, Hoosier Squadron.
NARA USS Graback SS-208 Report of Second War Patrol
NARA USS Grayback SS-208 War Diary May 4, 1942 to May 31, 1942
NARA USS Grayback SS-208 War Diary June 1, 1942 to June 22, 1942
NARA USS Grayback SS-208 War Diary July 15, 1942 to September 3, 1942
NARA USS Graback SS-208 Report of Fourth War Patrol
Combined Fleet - Submarine Operations Research Group Attack Data USS Grayback (SS-208)
Naval History and Heritage Command - Grayback (SS 208)
American Battle Monuments Commission - John A. Moore
FindAGrave - John A. Moore (photo, Navy Cross citations)
NavSource USS Grayback (SS-208)
Lost 52 Project - USS Grayback SS-208 Expedition 2019
New York Times "Navy Submarine, Missing for 75 Years, Is Found Off Okinawa" November 10, 2019
1,400' / 426.7m
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