Sherlock Holmes (1984)

S2E9 Blinky Bill and the Earthquake

As Blinky's gang continues their camping adventure, they decide to wander into a mountain mine for some exploration. However, they soon find themselves trapped when part of the mine collapses. While searching for an escape, they encounter a terrifying Goanna that starts chasing them through the dark tunnels and down a mine shaft in carts. After finally breaking free from the mine and navigating down a river, Blinky's gang realizes they've ended up far away and completely lost from Greenpatch.