NASA's Mars Atmosphere and Volatile Evolution (MAVEN) mission is seen in this undated artist's concept released September 22, 2014.Reuters

A woman claiming to be a former employee of the United States space agency has said she saw two human beings walking on the surface of Mars when she was watching footage from Viking Mars Lander in 1979.

The revelation of the 1979 'incident' by the woman, called Jackie, has once again piqued the interest of conspiracy theorists.

Jackie has claimed she worked for NASA and that the mysterious 'citing' happened when she was on duty. She said she saw two spacesuit clad human beings walk towards the Viking Lander on Mars.

Jackie said she was handling the downlink telemetry from the Viking lander along with six colleagues when she witnessed the mysterious incident.

According to multiple media reports, Jackie called in to Coast to Coast AM in America burdened with the weight of a nearly 30-year mystery. 

She called in to the radio show as she wanted help to solve the mystery that has been plaguing her for about 27 years.

"That old Viking rover was running around," she said, saying that she and half a dozen of her colleagues were watching this on multiple screens. "Then I saw two men in space suits – not the bulky suits we normally used, but they looked protective. They came over the horizon walking to the Viking Explorer."

The Viking Explorer is the first vehicle to send back images of Mars, and in the late 70s Jackie was allegedly handling downlink telemetry from the lander.

"We ran upstairs – but they locked the door, and taped paper over the door so we couldn't see. My question is – were they our guys?"

Conspiracy theorists are having a field day with these claims, as they believe Jackie's claim gives them further proof that secret landings on Mars were carried out in the 60s and 70s. 

Former CIA pilot John Lear previously claimed that NASA landed on Mars in 1966, and humans were able to breath the thin Martian air.

Interestingly, yet another popular theory by plasma physicist Dr John Brandenburg has it that Mars was home to two ancient civilisations, which he has named Cydonians and Utopians. According to him, these two civilisations were wiped out as a result of two nuclear explosions on the Martian surface by an yet unidentified alien race.

He has supported his theory by pointing out that the composition and colouration of Martian soil are consistent with fallout from a series of "mixed fusion-fission explosions."

"Given the large amount of nuclear isotopes in Mars atmosphere resembling those from hydrogen bomb tests on Earth, Mars may present an example of civilization wiped out by a nuclear attack from space," Brandenburg claimed in "Evidence of Massive Thermonuclear Explosions in Mars Past, The Cydonian Hypothesis, and Fermi's Paradox," according to Inquisitr.

Although other scientists agree that Brandenburg is right about his observations about the soil, high concentrations of Xenon-129 in the atmosphere is not surprising as it's a commonly found substance, noted The Huffington Post.