8 Jun 1943
Approx. 14.00 hrs, mid-Atlantic south of Iceland: the boat was damaged by depth charges from a British Hudson (269 Sqdn RAF/K, pilot Sgt R.B. Couchman) near convoy SC-132.A follow-up attack by a second Hudson (269 Sqdn RAF/H, pilot F/O J.A. Turnbull) was frustrated when the depth charges failed to release on two attack runs. Flak damaged the aircraft in several places, and F/O Turnbull then warned an arriving American Catalina (VP-84 USN) that the boat would remain surfaced and fight it out. The flying boat shadowed U-535 without attacking until she was able to escape at dusk. (Sources: Franks/Zimmerman)

5 Jul 1943
The sinking of U-535 16.55 hrs, off Cape Vilano, Spain: a group of three inbound boats (U-170, U-535 and U-536) was attacked by British B-24 Liberator BZ751 (53 Sqn RAF/G, pilot F/S W. Anderson, RNZAF). All three boats successfully evaded the first attack, and U-536 was merely strafed during the second because the depth charges failed to release. As leading boat, U-536 then gave the signal to dive, but for unknown reasons U-535 remained surfaced and had to face the next attack alone. Despite flak damage to wings, fuselage and tailplane, the aircraft straddled U-535 with eight depth charges just abaft the conning tower and she sank with all hands. Due to the damage and one man being wounded by flak, the aircraft left the area immediately and returned to base. (Sources: Franks/Zimmerman)

2 recorded attacks on this boat.