Ben and the digger

Ben is a little fidget who loves diggers. A magnificent one is now working right on his street. As soon as he notices that the digger driver has forgotten the keys in the ignition, he doesn't wait for a second. He starts it up and digs a hole! Later, while walking past the hole, he accidentally falls in. What now? Luckily, he has a torch and his favourite toy in his pocket – a small digger. It turns out to be magical and capable of great things. Can he find his way through the intricate underground and get back to the surface?