Almost 400 swimmers put up with the 55 degree water and the large swells to swim from Alcatraz to Crissy Field, a 1.5 mile water trek.
Among the group was 9-year-old Jordan Freer. She could be the youngest female to ever swim from Alcatraz.
"We were off on our own and one of the kayaks came up and told us we were exactly where we should be and everybody else was in the wrong spot, so we felt pretty good about that," Jordan's dad Tom Freer said. "And we just kept aiming for the gold dome."
Jordan says the scariest part of the swim was jumping off the boat near Alcatraz.
She made the swim in about 45 minutes -- faster than many adults.