Daniel Casillo says he swam to JFK Airport after his jet ski stalled in Jamaica Bay in August.
He was able to penetrate the airport's state of the art security system by climbing a fence and making it past motion sensors and surveillance cameras designed to nab terrorists.
Casillo walked across two runways and into a Delta terminal, dripping wet, before being noticed.
He was arrested by stunned security officials.
You can catch the entire exclusive interview Wednesday on "Good Morning America" on Channel 7.
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