Thunderbirds/Recap/S1 E9 End of the Road

Eddie Houseman, one half of the Gray and Houseman Construction Corp., leaves his giant roadbuilding machine for a well-earned vacation, which he spends with his old flame Tin Tin Kyrano on Tracy Island. This, of couse, fires Alan Tracy with seething jealousy. During the trip, however, Houseman receives a disturbing telephone call - the cutting through which the road his company is builing must travel is not as stable as first thought. If it collapses, the lost time will mean that his company fails on their contract, and will fold as a direct consequence. Heedless of the risk to his own life, Houseman sneaks off in the night with an explosives tractor to attempt to blast the rockface clear of the cutting.

He succeeds, but the concussion knocks his craft halfway off the high, narrow road. Unable to move lest the truck overbalance, Houseman's collegues radio for help. International Rescue responds, knowing that allowing Houseman to see them will destroy the cover so essential to their work.