Updated

The outraged head of the Port Authority police union Sunday demanded an investigation into how a swamped jet skier was able to breach Kennedy Airport’s troubled $100 million security system.

Paul Nunziato, president of the authority’s PBA, will send a letter to PA big Patrick Foye “demanding a PA inspector’s general investigation into the failed Perimeter Intrusion Detection System, the cost over-runs and the relationship between the Port Authority and Raytheon, the vendor,” said Robert Egbert, a PBA spokesman.

The demand for answers followed an exclusive report in The Post Saturday on how the marooned jet skier easily overcame the supposedly fool-proof security system at JFK.

After a night of partying with pals, sinking his jet ski and swimming to shore, Daniel Casillo, 31, of Howard Beach, New York strolled undetected across two runways and into a terminal.

Neither motion sensors nor closed-circuit cameras of the Perimeter Intrusion Detection System, or PIDS, detected Casillo, who was only busted when he approached a startled Delta Airlines worker near Gate 10.

More On This...

Earlier that night, Casillo had been drinking at a Rosedale watering hole with his buds when they decided to go out racing their personal watercraft. Casillo got separated from his partners as darkness fell, and then his jet ski conked out -- so he swam 3 miles to a runway at the airport.

Casillo -- in a bright yellow life vest -- climbed the eight-foot tall perimeter fence and made it all the way to Terminal 3 without anyone noticing.

Once apprehended, he was charged with criminal trespass.

Click for the full story from the New York Post.