Turret 35B (Busy Gap) (grid reference NY79906973) is at the top of the ridge before the descent into Busy Gap.[6] It was located in 1913 and excavated in 1946.[6] The excavations showed that the turret had narrow walls and a door to the east.[6] There are no visible remains above ground except for an earthwork platform measuring 3.8 metres by 5.5 metres and up to 0.5 metres high.[6]