When I moved to Hawaii in 1987, there were several studies under way. One was from the state Department of Business and Economic Development, and it predicted that deepsea mining of minerals like manganese was "25 years away."
The other was by the county, for a garage to expand parkng space at the Wailuku Municipal Lot.
The undersea mining study was re-issued a few times but that idea has, thankfully, faded into the history of undoable things.
The parking garage, on the other hand, is still having money wasted on it. Today's Maui News has a story about a proposed $75 million stucture that would add a net 246 spaces.
That's just an estimate, but the estimate comes to $304,878.05 per stall.
It'll never happen.