SAN FRANCISCO -- A Red Bull athlete made history with a daring but controversial stunt across the San Francisco-Oakland Bay Bridge.

The bridge closed temporarily on Saturday as a result.

Two-time X Games medalist Sean MacCormac could be seen jumping over 5,500 feet from the sky before riding down the bridge's suspension cables .

He then landed on a floating platform.

MacCormac is a pioneer of skysurfing, where the skydiver wears a board attached to their feet and performs tricks in the air.

With over 22,000 skydives under his belt, MacCormac says this was one of the most technical things he's ever done.

It required 18 months of preparation.

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