(NEWSER) – Florida native Christopher Le Cun was out enjoying a day on the boat with his family and best friend on July 12, 2015, when the two decided to anchor to a buoy and scuba dive down to mysterious structures faintly visible below.

Le Cun swam up to one that he likened to a building and felt a sudden, strong current. "He got sucked in like a wet noodle—he just, poof, gone," his diving partner Robert Blake tells WPTV. Le Cun says his surroundings instantly dissolved into "complete darkness" and he struggled to hold onto his mask and regulator while he spent roughly five minutes being sucked through a 1/4-mile long, 16-foot wide intake pipe that pulls in 500,000 gallons of water a minute to cool the St. Lucie Nuclear Power Plant's reactors.


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