Rigged Perimeter Tunnel (Goodge Street Base)

Jamie traps himself in this narrow passage next to the Goodge Street base while the team positions explosives to collapse it and block Yeti drawn through by the Great Intelligence's signal. The Yeti presses forward amid the threat of detonation, its movement echoing off confining walls. Sabotage removes the explosive store's padlock, heightening betrayal. Blowing the tunnel severs the route to the TARDIS at Covent Garden, turning escape path into sacrificial barrier. Cool, damp air fills the space with tension and isolation as soldiers weigh Jamie's fate against the invasion.