Tunnel Trap! is a rhyming magazine story.
Percy has been very busy and is looking for a place to sleep for a short while. So he reverses into an old disused tunnel and falls asleep. Shortly, Thomas arrives with a load of timber and a crane to block up the old tunnel. When Percy wakes, he gets a shock when he finds that he has been blocked in! Percy thinks quickly and knows just what to do; he charges forwards, smashing his way out of the tunnel!