Going Underground

S18 E106: One day while repairing an embankment, Marion strikes something hard and insists it must be the mast of a Viking ship. It looks like a water pipe to Thomas, but Marion is adamant that it isn’t. The next day Thomas notices flooding near the bank. Marion has to admit her mistake and help prevent an accident. Percy misses his friend Gator and keeps thinking about the good times they had together. Percy is sad, so the other engines advise him to keep busy to take his mind off it. Percy rushes about trying to keep busy, but he loses control of some trucks. The trucks roll into an old mine. Percy is too frightened to go in after them until he remembers what Gator taught him about being brave!