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POUGHKEEPSIE, N.Y. -- It's like a massive welcome mat that sits on the bottom of the Hudson River and Central Hudson hopes it will open doors to a cleaner river.

Crews were hard a work using a crane to pull the two ton mats off the river floor. Central Hudson says the mats have been in the river for more than a year and says they are testing them to see how well the mats trap contaminants that have made it into the river from the company's old Manufactured Gas Plant site. The plant closed in 1972 and the site is on the Poughkeepsie waterfront.

The company says they expect the project to last until the end of the month.