, produced by the Atlantic, footage taken after Schooley took part in a test run on the ride shows him saying: "That was truly exciting.
"Because we really didn't know whether we were going to survive it or not.
"Usually on a ride, it might be scary, but you figure that they have it figured out.
"And we didn't know whether we had it figured out or not."
Footage in the documentary shows rafts filled with sand bags repeatedly becoming airborne during testing.
Park co-owner John Schooley said during testing he 'didn't know whether he was going to survive' the slide Caleb met and followed all the safety requirements for the ride Riders were strapped into three-person rafts with nylon harnesses Credit: AP Court documents also reveal that a team of experts who inspected the slide after Caleb's death found “physical evidence that indicated that other rafts had gone airborne and collided with the overhead hoops and netting before the fatality.”
An engineering firm hired to inspect the ride one week before its opening also issued a report that "guaranteed that rafts would occasionally go airborne in a manner that could severely injure or kill the occupants.”
'EXPERTS ADVICE WAS INCORRECT' Other footage taken during the ride's development shows Henry saying: "Every bit of advice we've been given from the brightest brains and the smartest engineers, mathematicians, just have not been correct."
The original opening of the ride, later attended by the governor of Kansas and the mayor of Kansas city, was also delayed at one point due to safety concerns.
During their trial, the state alleged that Schooley and Henry had rushed the ride's construction, skipped “fundamental steps in the design process,” and relied “almost entirely on crude trial-and-error methods” for safety testing.
Co-owner Jeff Henry said during testing that advice he had been given by engineers was ‘incorrect’ Charges against the owners of the Schlitterbahn water park were dropped in February of this year Credit: Getty Images Speaking about the safety measures that were in place at the park, one former employee said: "The only inspections we've ever done is just people riding down slides one time, saying 'Oh, it's okay. You're good to go for the rest of the day now.'"
Tyler Miles, the operations manager of the park, had reportedly received 17 separate staff reports during the 2015 and 2016 summer seasons about how the raft in which Caleb was riding when he died required maintenance, including five in that week alone.
An indictment filed later alleged that the raft had “a propensity for going abnormally fast and going airborne more frequently than other rafts”.
Kansas law required parks like Schlitterbahn to inspect features of its rides like seatbelts, brakes, and safety barricades daily but, unlike other states, no state agencies did the inspections, they aren’t made public, and reports do not have to be turned over to the state.
The slide was torn down in November 2018 after the probe into Caleb's death had been completed Credit: MARK STGEORGE We pay for your stories! Do you have a story for The Sun Online news team? Email us at tips@the-sun.co.uk or call 0207 782 4368 . You can WhatsApp us on 07810 791 502. We pay for videos too. Click here to upload yours.