The mines' elevators don't work
In the mines, next to where Dizzy drops in, stands the elevator control machine, and none of the mines' lifts will move.
Nudge 1Where to look
Machines are mended with tools. There's one by Silver Stream.
What you needOther problems to solve first
Solve these first (each opens its own page, no answers on the way):
Show the solutionThe whole answer, with a video
Bring the machine wrench (Silver Stream, the right side) and drop it at the control machine: it's repaired, and the mines' lifts work (stand in the middle, press B). Nearby lies the key for Grand Dizzy's elevator: take it home (Grand Dizzy's elevator).