The best sailors in the world are competing for the oldest trophy in international sport. The America's Cup.
The technology on the water, in the San Francisco Bay, is something the world has never seen.
Sailors are racing AC72s, which are wing sail catamarans.
They're 72-feet long, and equipped with a hydro-foil that allows the boats to rise from the water.
The vessels are the fastest ever, with speeds in excess of 50 miles per hour.
Race organizers introduced the technology to make the sport more watchable, but it has come at a cost.
Last May, Andrew Simpson, a British gold medal Olympic sailor, who raced for Sweden's team Artemis, died when the team's boat capsized.
Simpson was trapped under the water for ten minutes.
Another incident in October of 2012 drew negative attention when Team Oracle USA's boat capsized.
No one died, but the wing sail broke apart and the $8 million dollar boat was destroyed.
Marcus Young is a staff commodore at the Golden Gate Yacht Club. It's the very club that's defending this year's trophy.
Young was the club's Commodore in 2010 when Team Oracle USA won the cup back after a 15 year drought.
Young was the first person to hoist the trophy before handing it to Team Oracle USA's financier, Larry Ellison.
Young said, "I think people fail to realize that the sport of sailboat racing is inherently dangerous. It's always been that way."
The avid sailor hopes that folks from all over the state and the world attend races to see the AC72s in action.
"I think the AC72 is probably the right platform to reintroduce the America's Cup to the American public," said Young.
New rules have been put into place to better protect the athletes.
All Marcus can hope for now is to defend the cup that bears America's name.
Young said, "I think anybody who misses the opportunity to be able to come down here and see what's going on with the Louis Vuitton Cup and America's Cup is missing a great opportunity, because we're not sure if it's going be here again."
The Louis Vuitton Cup is the challenger series.
The winner will take on Team Oracle USA in the America's Cup finals.
For a full schedule of events, and more information head to www.americascup.com/