Underwater city?

Sea level is projected to rise as much as 23 inches, causing flooding of "critical infrastructures of Lower Manhattan to waterfront homes on Long Island" as "some major insurers have withdrawn coverage from thousands of homeowners in coastal areas of the Northeast including New York City."

NYC warming quickly: Study

Toward the end of this century New York City is projected to face the possibility every 10 years of experiencing the kind of flooding it would previously have endured only every once in 100 years.