ANNAPOLIS, Md. (AP) — The 20th annual Polar Bear Plunge was held in Sandy Point State Park on Saturday.

Nearly 10,000 people were expected to jump into the chilly waters of the Chesapeake Bay to raise money for Special Olympics of Maryland and its year-round program.

The event was coordinated by Maryland State Police.

Most participants raise $75 each for a plunge in the water at. But some “super plungers” raise thousands of dollars to jump in the frigid water multiple times.

So far this year the Plunge has raised over $1.5 million, according to the organization’s website.