Barrage Balloon Site: e25875 (Extant)20th September 2022 in Barrage Balloon / Orkney tagged balloon / barrage / e25875 / site by Colin Concentric rings of concrete anchor blocks used to hold the balloon when lowered. These at Neb on Flotta have been exposed by peat cutting. Barrage Balloon Site: e25875 Barrage Balloon Site: e25875 Barrage Balloon Site: e25875 Barrage Balloon Site: e25875 Barrage Balloon Site: e25875 Typical centre block for barrage balloon.