[1] Engaged in trials as improved engines were developed for her class, S-35 was ordered to New London, Connecticut, in September, for alterations by the prime contractor, the Electric Boat Company.

Exercises along the East Coast and in the Caribbean Sea followed and, in early August, she arrived at San Diego, California, her home port until 1925.

Then transferred to the Asiatic Fleet, she departed from San Francisco, California, in mid-April and arrived at the Submarine Base, Cavite, Philippine Islands, on 12 July.

In 1934, she won the Marjorie Sterrett Battleship Fund Award for the highest merit in battle torpedo practice of submarines.

In April 1941, she was transferred to San Diego, California, and, for the remaining months of peace, she provided services for the West Coast Sound School.

After the Japanese attack on Pearl Harbor on 7 December 1941 brought the United States into World War II, S-35 added defensive patrol work to her duties; and, in January 1942, she moved north to Mare Island, California.. for limited modernization and overhaul.

In late March 1942, she continued northward and, in early April, arrived at the newly established submarine base at Dutch Harbor.

The blasts forced her down further than expected, but she regained control at 220 feet, returned to her intended depth; and maneuvered out of the immediate area.

The crew received medical attention, the boat was scrubbed down and refitted; and requests for modern equipment, including sonar and radar, were made.

Toward the end of May, the submarine was ready for sea; and, on 28 April, she moved west in response to intelligence reports of a Japanese invasion force bound for the western Aleutian Islands.

On 11 June, she was ordered back to Dutch Harbor to replenish; thence, she was routed to the western part of the archipelago for offensive operations near Kiska which had been taken by the Japanese.

The thick fog which had shielded the Japanese force as it crossed the Bering Sea had remained over the Aleutians during her patrol, impairing visibility and hindering her offensive efforts.

She then headed back toward Dutch Harbor, but was diverted north and west of the island to provide weather reporting services to the force scheduled to bombard Kiska on 7 August.

After the raid, she returned to Dutch Harbor, thence proceeded to San Diego, where for six weeks she underwent overhaul and provided services to the sound school.

From then until her return on 22 November, she battled heavy seas, storms, and problems arising from her inadequate and outmoded equipment as she hunted the Paramushiro-Attu-Kiska convoy routes.

Cold weather added icing to the climatic hazards of the northern Pacific Ocean; but, on 11 December, S-35 headed out of Dutch Harbor again.

On the afternoon of 21 December, she ran into a storm while surfaced off Amchitka; and, by early evening, waves were smashing over the bridge and cascading into the control room.

Shortly thereafter, two volunteers, using oxygen charged lungs, entered the room; flooded the magazines; partially blew the Number Three main ballast tank to gain more freeboard; and shut the auxiliary induction to seal the forward battery.

The engines were started again; a fire extinguisher watch was set over the section of cable still arcing; and a bucket brigade was organized to assist in keeping down the water level.

Arriving at noon on 24 December, the boat was ventilated; medical help was obtained; four men were hospitalized; and mattresses, bedding, and clothing were dried.

Usable equipment was removed for installation in other S-boats, and, on 14 January 1943 she began the long trip to the Puget Sound Navy Yard for repairs.

Despite numerous material casualties, which slowed her to an average speed of a little more than 5 knots, she continued toward the Kuril Islands and arrived in her patrol area on 25 June.

Her starboard engine soon went out of commission; and, as repair work was started, a freighter and a destroyer were sighted approaching on a course which would bring them over her position.

Clear weather arrived with dawn of the last day, and, that afternoon, the submarine sighted a destroyer patrolling in concert, apparently, with a flying boat.

In January 1945, she proceeded to San Diego for inspection and repairs, and, in February, she returned to Oahu for use as a damage control school ship.