New York Gov. Andrew Cuomo, champion of a $100 billion infrastructure plan, wants the state to build even more.

The Democratic governor is calling for a bridge or tunnel to be constructed across Long Island Sound, connecting Suffolk and Nassau counties with Westchester County. A recent feasibility study concluded a tunnel could cost as much as $55 billion, which would make it one of the costliest infrastructure projects in the U.S.

The Cuomo administration began soliciting interest in January to build and finance the project. Submissions are due in April.

“In terms of thinking big and projects that can be transformative for the region, this can be one of the biggest,” said Kevin Law, president of the Long Island Association, an economic and business advocacy group. He said it would open up Westchester’s talent pool to Long Island employers and vice versa.

A new crossing could trim Long Island-to-Westchester commutes to under an hour from over 90 minutes, according to the state’s feasibility study.