Contractors on the South Atlantic island St Helena are installing nearly 4km of Geoburgg GBE rock fall barriers using helicopters.
They will secure unstable rocks on both sides of Jamestown, the island’s main town. The barriers are designed by consultant WA Fairhurst and are being installed by Can France.
Can France completed previous emergency repairs on the island in March 2009, after 300t of rock fell on buildings including a school in 2008. The Department of International Development and FCO Territories funded those repairs.
The island’s volcanic geology makes it prone to landslides. Cliffs and valley sides are unstable layers of lava, ash and pyroclastic deposits, easily eroded, and compressed by the weight of overlying dense basalt rock.