It’s fire station versus fire station in an all-out competition of the “League Of The Strong, Cold And Courageous.”

Firefighters will swim the chilly waters of the bay from Alcatraz to the mainland Friday morning and a trophy will be awarded to the first-place male and female swimmer. The station with the greatest participation will be placed on a perpetual plaque.

All proceeds go to the San Francisco Firefighters Cancer Prevention Foundation. Cancer is a tough subject when it comes to firefighters.