Giant tunnels to safeguard power supply network

SP Group staff riding electric bicycles yesterday in the tunnel network of the Underground Transmission Cable Tunnel Project. Above them is a prototype model of an automatic inspection vehicle, the final version of which will be used to monitor the t
SP Group staff riding electric bicycles yesterday in the tunnel network of the Underground Transmission Cable Tunnel Project. Above them is a prototype model of an automatic inspection vehicle, the final version of which will be used to monitor the tunnels for water seepage and fires.PHOTO: LIANHE ZAOBAO

$2.4b effort to house 1,200km of cables is among deepest such projects worldwide