8 Jun 1943
About 14.00 hours, the boat was attacked and damaged by depth charges from a British Hudson aircraft (269 Sqdn RAF/K, pilot Sgt R.B. Couchman) near convoy SC-132.A follow up attack by another British Hudson aircraft (269 Sqdn RAF/H, pilot F/O J.A. Turnbull) was frustrated when the depth charges failed to release in two attack runs. AA fire damaged the aircraft in several places and the pilot warned an arriving American Catalina aircraft (USN VP-84) that the boat will stay up and fight, so the flying boat only shadowed U-535 until it escaped at dusk. (Sources: Franks/Zimmerman)

5 Jul 1943
The sinking of U-535 At 16.55 hours, a group of 3 inbound boats (U-170, U-535 and U-536) was attacked by the British Liberator aircraft BZ751 (53 Sqdn RAF/G, pilot F/S W. Anderson, RNZAF) near Cape Vilano, Spain. The boats evaded the first attack and only U-536 was strafed in a second because the depth charges hung-up. The leading U-536 then gave the signal to crash-dive, but U-535 remained surfaced for unknown reasons and had to face the next attack alone. Despite of AA hits in the wings, fuselage and tailplane of the Liberator, the boat was straddled by 8 depth charges just abaft the conning tower and sank with all hands. Due to the damage and a wounded crewman, the aircraft immediately had to left the area and safely reached its base. (Sources: Franks/Zimmerman)

2 recorded attacks on this boat.