THE lead investigator of the infamous Roswell crash revealed a second UFO site where an alien "was found still breathing", according to Jesse Marcel’s grandson.

Speaking to the Sun, Marcel’s grandson, also Jesse Marcel, says "very credible sources" saw the three extra-terrestrial corpses among the wreckage and even said one was “still breathing" at a second crash site.

However, the location of the mysterious second crash site is not known.

The 57-year-old also says he's tracked down a mystery "beam" from the spacecraft more than 50 years after all evidence of Roswell was "vacuumed up."

The bizarre object is said to be "lighter than a feather but as strong as steel" and could hold the answers to many questions left unanswered about the crash.

Jesse said: "The way he put it there was a second crash site which is a bigger part of the ship.

“They said that there were alien bodies in the second crash site...there are supposedly up to three bodies.

"A couple of them died in the crash but one was still alive. He didn't go to specifics but just said 'Listen to these people' because what they were saying was true.

Jesse believes Major Marcel was forced to keep quiet and "threatened several times".

Debris from the collision site suspiciously disappeared soon after meaning no trace was left for scientists to examine or investigate.

But now Jesse believes he has made a crucial discovery and has located a piece of debris which could shed light on what is "ground zero of the modern UFO mystery".