Bashaw sank three Japanese merchant vessels totaling 19,269 gross register tons as well as several small craft.

After voyage repairs and provisioning, Bashaw and the submarine USS Blackfish (SS-221) got underway on 10 March 1944 to patrol off the Palau Islands in the hope of intercepting Japanese ships trying to escape through Toagel Mlungui Pass.

Firing six torpedoes, Bashaw scored one hit, but she was unable to regain position to sink what proved to be the salvage ship Urakami Maru.

On 13 April 1944, a U.S. Navy PB4Y-1 Liberator patrol bomber mistakenly bombed Bashaw in the Pacific Ocean 415 nautical miles (769 km; 478 mi) west-southwest of Truk Atoll at 04°30′N 147°26′E / 4.500°N 147.433°E / 4.500; 147.433.

Before the night was over, she scored three torpedo hits on Yamamiya Maru, a 6,440-gross register ton Imperial Japanese Army cargo ship, and sank her.

After training exercises, Bashaw stood out of Seeadler Harbor for her third war patrol on 7 August 1944, bound for the Mindanao Sea and Moro Gulf in Philippine waters.

On 9 September 1944, she assisted four airplanes to sink a 225-gross register ton interisland supply ship loaded with drums of fuel oil.

Following a refit, Bashaw began her fourth war patrol on 27 October 1944 in a coordinated attack group which also included the submarines Flounder (SS-251) and USS Guavina (SS-362).

The lone hit failed to damage the tanker severely enough to sink her, and Bashaw was unable to reach a firing position again.

Upon her arrival at Pearl Harbor on 22 August 1945, Bashaw received orders to return to Mare Island Navy Yard to prepare for inactivation.

She then was placed out of commission in reserve at Hunters Point Naval Shipyard in San Francisco, California, where from May 1952 to March 1953, she underwent conversion to a Type IT anti-submarine "hunter-killer submarine".

[9] In January 1960, Walsh and Jacques Piccard made a record descent in Trieste to the bottom of the Challenger Deep, the deepest known point of the seabed of Earth.

Bashaw was one of several submarines alerted for support during retaliatory air strikes on North Vietnam by U.S. forces, but she ended the cruise in October 1964 without incident.

Upon her return to San Diego on 21 December 1965, she resumed antisubmarine warfare training operations until she entered the Hunters Point Naval Shipyard on 16 May 1966 for a four-month overhaul.

Sources claim both that she was sunk as a target off Hawaii in July 1972 and that she was sold for scrap to the National Metal and Steel Corporation on 4 August 1972.

[citation needed] This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.