The official explanation given by the NTSB concluded that the crash of TWA Flight 800 on July 17, 1996 was caused by an electrical short circuit that led to a gas explosion. Seventeen years later, a new documentary delves into the claims of six whistleblowers originally tasked with the investigation who say they're challenging the government's findings.

The whistleblowers told filmmakers that all evidence pointed toward an external detonation causing the crash, one of them recounting how he was convinced the plane had been damaged by a "high explosion." When he asked the FBI to test out a sample of the damaged aircraft to be certain, things took a strange turn.

"[I asked them to ] swab this piece, and check that for me, and they did, and sure enough it tested positive - which I was sure it would do," he said. "So, they picked up the phone and called somebody, and 90 seconds later, three FBI agents ran in the room [...] and physically pushed me aside and wouldn't let me hear the conversation and then turned to me and said, 'The machine has frequent false positives.'"

Fox News correspondent Rick Leventhal has been investigating the claims of the six himself and on Tuesday sat down for an exclusive interview with James Kallstrom, the former FBI Special Agent in charge of the investigation. 

Kallstrom calls the claims of any sinister facets at play nonsensical, adding that the government spared no expense in researching the cause of the crash.

"The reality was, there was no evidence of a missile hitting the plane,"  he told Leventhal