Hello all, I've been trying to figure out the name of this movie for so long it's driving me nuts. I could have sworn it was called quest but it doesn't come up on any searches. It's about a young kid inventor named davey who lives with his father. He has a bicycle that attaches to railroad tracks and has a girlfriend who follows him everywhere. He makes this diving suit to look for a monster in a old quarry filled in that turns out to be a old steam shovel covered in seaweed. He gets stuck underwater and the whole town comes to rescue him. It's set in australia and the aboriginees call the steam shovel "donkashen" poor spelling.

Yep, you're right about the name, aka...

Frog Dreaming (1986) (http://www.imdb.com/title/tt0091810/)

Wow thank you, I knew it was the quest, lol. Why is it under frog dreaming though? All the movie photo's say the quest, strange.