Lewis Pugh made history a few days ago as the first person to swim the entire Hudson River — unassisted.

It took him 30 days: from Aug. 13 in the Adirondack Mountains, straight down to lower Manhattan, wrapping up on Sept. 13.

He swam a total of 315 miles.

Pugh, U.N. patron of the oceans, joined NY1’s Cheryl Wills on “Live At Ten” Wednesday to talk about his experience and activism.