Metal Time Treasure Finder

Minerals have to be mined in areas covered with water. And here fantastic structures come to the rescue- floating platforms. This is almost a city block on the water with residential blocks: factory building, mechanisms. helipads and even its own tower. It is this tower which give the platform a characteristic skyline. Vey few people have seen the platform in real life.
But with this model reality comes close.
Once finished there is this rewind mechanism to let the crane on the platform turn, and a Genius lift-system let you bring the helicopter platform up and down.
Not a simple job, but worth building.