London.

Angle shot of G.P.O. Tower (Post Office Tower). LV. Pan, interior, the Museum Telephone exchange. CU. Telephonists. LV. Telephonists. SV. The automatic exchange, & SCU. & CU. LV. Men entering tunnel under tower. LV. Men walking in tunnel. SV. Men working on wires, & CU. & CU. LV. Interior, technicians in front of monitor screens. CU. Technicians. CU. The monitor screens. LV. In the tunnel, electric tractor comes towards camera. SV. Very thick cable coming off drum. CU. Cable going along floor of tunnel on runners. LV. The tractor pulling the cable. CU. Travel shot along the tunnel showing cables. LV. Tracking shot, tractor going along tunnel. GV. London from top of tower.