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USS S-28 (SS-133)

USS S-28 (SS-133) patch

The USS S-28 (SS-133) was a S1-class World War II era submarine.

On July 3, 1944, the S-28, captained by reservist Lieutenant Commander Jack G. Campbell, left the submarine base at Pearl Harbor to conduct training exercises with the Coast Guard cutter Reliance. On July 3 and 4, she acted as a target for Reliance's crew to help train them in American antisubmarine warfare techniques. During the late afternoon of July 4, all contact with the S-28 was suddenly lost. 1

A thorough search was conducted for the S-28 through the afternoon of July 6, 1944, when a diesel oil slick was found in the area where she had been operating . A subsequent Court of Inquiry stated that the S-28 had lost depth control "...from either a material casualty or an operating error of personnel, or both, and that depth control was never regained.  The exact cause of the loss of the S-28 cannot be determined." The Court of Inquiry also determined that the submarine sank shortly after 1820 on July 4, 1944, at 21° 20' N, 158° 23' W, in 1,400 fathoms of water. It was also stated that the loss of the S-28 was not caused by negligence or inefficiency of any person or persons. Because of the depth of the water, salvage operations were deemed impossible. 2

The S-28 was awarded one battle star for her service in World War II. Her JANAC score is one ship sunk, the 1,368-ton converted gunboat Katsura Maru No. 2, on September 19, 1943. Her Alden-McDonald tonnage score is the same. Her SORG score is one vessel sunk worth 4,000 tons. 3

A list of the personnel lost with the S-28 is maintained at On Eternal Patrol.

On December 20, 2017, Tiburion Subsea announced that the hulk of the S-28 was found in 8700 feet of water off the coast of Oahu, Hawaii. For additional information see the following links.

Patrol Data & Tonnage Scores


1. Roscoe, Theodore, United States Submarine Operations in World War II, p. 347.

2. Ibid., p. 347-348.

3. Alden, John D., and Craig R. McDonald, United States and Allied Submarine Successes in the Pacific and Far East During World War II, Fourth Edition, see USS S-28 (SS-133), Attack No. 1127; Submarine war patrol reports on CD, data collected by the Submarine Operations Research Group (SORG) in the report "Results of U. S. Submarine War Patrols Listed Alphabetically by Name of Submarine"; Japanese Naval And Merchant Shipping Losses During World War II By All Causes, Joint Army-Navy Assessment Committee, USS S-28 (SS-133).