The downtown segment will be another $10 Billion in massive subsurface sea level rise ground water construction nightmares on Pensacola St. They are already running into huge underground rivers. Old City maps show the Pensacola St. area as springs, ponds, canals, etc. Modern streets were put in during dryer climate and lower sea levels. It doesn't take much sea level rise to affect areas 100 yards inland.
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$45,000 an inch in 1992 when construction was underway for the First Hawaiian Bank building. when it ran into a huge underground river. As the climate and big storms
create even larger water flows, along with rising sea levels and ground water, the problems will never go away, only get worse. 
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In he $300 million HART Rail EIS repeatedly LIED about not being in flood, tsunami, hurricane storm surge zones - like Houston right now. The entire next rail segment will be flooded, billions in damages- yet these morons keep funding this insanely BAD ROUTE that should be mauka. Stupid!