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But help didn’t come, and the stranded Casillo swam three miles toward the only thing he could see — the lights of Runway 4-Left, which sticks out into the bay.

“He didn’t want to go that way, because you’re not allowed to go over there,” Cowan told The Post.

Dripping wet and in a bright-yellow life jacket, Casillo climbed the perimeter fence, which is eight feet high, and walked across that runway and intersecting Runway 31L — and made it all the way to Terminal 3 without anyone noticing.

Casillo was finally apprehended when he approached a Delta Airlines worker near Gate10. He was charged with criminal trespass.