National Grid staff's 500ft climb to keep power working
Engineers are scaling dizzying heights to replace equipment and keep power flowing across the River Severn to supply homes and businesses.
They are climbing the two 500ft (152m) towers which stand either side of the estuary to install new insulators on the arms.
The arms carry the weight of the wires that span the mile-long river crossing.
31 Mar 2017
- From the section Wales