There's trouble Down Under as Matt, Jo and Dad set off on a new fossil-hunting adventure in the opal mines of Australia: the local miners seem to want them gone, Jo's showing signs of opal fever, and those claustrophobic tunnels don't look very safe either.

There's trouble Down Under as Matt, Jo and Dad set off on a new fossil-hunting adventure in the opal mines of Australia: the local miners seem to want them gone, Jo's showing signs of opal fever, and those claustrophobic tunnels don't look very safe either.