Kept away from towering cliffs abroad because of lockdown, top British climbers Pete Whittaker and Tom Randall are forced to look closer to home for adventure. Enter one of the most unusual climbs ever attempted – a 2,600ft horizontal groove beneath a motorway bridge on the M5. Sleeping on ledges suspended from the bridge, the pair face ferocious climbing moves, bridge-shaking traffic and police suspicion on this extraordinary Devon challenge.