Quote:
Originally Posted by Justin10000
Manhattan is very built up. There is a LOT underground. Not to mention, they are tunneling through some very hard rock. I am not surprised, if it costing that that much.
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Drilling in bedrock is typical for subway construction in large cities. Obviously they can't drill so shallow or else they'll hit the foundations and utilities along the way. Don't think such typical construction methods would warrant the large cost. I wonder what are the components of that 7.2 billion?
To put things into perspective, the Jubilee Line extension in London costed £3.5 billion, which at the time, was about USD $5.6 billion for about 10 miles of extra service and stations. That amount was actually double what was originally estimated. They had to re-engineer and pretty much rebuild Westminster interchange station. It looks so different today!