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But now, after a two-day investigation, one UFO hoax buster claims it is just a regular plane.
The UFO was filmed flying over the ocean for around nine minutes.
The video has just been made public by the Chilean Navy after being probed by the the Committee for Studies of Anomalous Aerial Phenomena (CEFAA), a government body which investigates UAPs (Unidentified Aerial Phenomenon) under the control of the Chilean Air Force.
The amazing video shows a dark, disc-shaped object flying above the sea, which “in two instances discharged some type of gas or liquid with a high thermal track or signal,” according to a naval technicians who filmed it.
At about eight minutes in, there appears to be an ejection of a plume of material, which then trails behinds the UFO, before another one happened.
The footage was caught on camera by the technician and a naval captain who were pilots in a helicopter over the ocean off Chile, and despite the extensive inquiry, no expert was able to explain it away.
CEFAA General Ricardo Bermudez said: “We do not know what it was, but we do know what it was not.”
But, now Mick West, an administrator for the Metabunk.org website, based in Sacramento, California, claims to have solved the case.
In an extensive article on the website, he pointed to evidence suggesting it was just a plane leaving aerodynamic contrails.
Using online flight records, he even tracked down two likely flights which were in the area at the time.
These were LATAM airlines flight 330 from Santiago to La Serena, also in Chile and Iberia Flight 6830 from Santiago to Madrid in Spain.
Mr West wrote: “This looks like a plane, flying away from the camera considerably higher than the helicopter (somewhere around 15,000 to 25,000 feet), that briefly creates an aerodynamic contrail.
“Based on analysis by @Trailblazer, @Trailspotter, myself, and others, there are likely TWO planes involved IB6830 and LA330.
“The plane that initially seems to fit best is LA330, a two engined A320, which was reported to be climbing through 20,000 feet at that exact visual position at 14:01:39.
“It was actually 65 miles away, not 35-50.
“This explains why it was not seen on radar – the actual plane was on radar, just not where they thought it was.
“The second plane is IB6830 which left earlier, and was climbing out more to the south, nearer to the helicopter.
“At the time this was spotted the plane was actually around 35 miles away.
“However it would very quickly get further away.”
The video was also looked at by IPACO.fr, a French-based UFO investigation group, which identifies hoaxes and misidentifications.
In a report, the group concluded: “The object observed in the video was most probably a medium-haul twin jet airliner in a landing phase, flying ahead of the helicopter at a higher velocity, with a low altitude and a low velocity, in view of landing.”
The video had baffled number of experts.
Nigel Watson, a UK-based UFO investigator, who wrote The UFO Investigations Manual, told Express.co.uk on Friday: “This is a very unusual object and it is noteworthy that South America is a hotbed for UFO activity.
“This is certainly a UFO that is hard to explain.”
The two witnesses had been convinced it was not a plane.
The video was filmed on November 11, 2014, from an Airbus Cougar AS-532 helicopter which was west of Santiago flying northwards at 4,500 feet and 152 mph.
A Naval technician was filming, when at 1.52 pm (local time) he spotted the UFO at about 40 miles away and zoomed in on it with infra-red.
Radar on board the helicopter could not detect the object.
The pair then made contact with radar operators at two stations, but neither could pick up the object, although they tracked the chopper they were flying in easily.
Enquiries with air traffic controllers found no recorded traffic in the area, and no aircraft were authorised to be where the UFO was seen, it was said.
The CEFAA held eight meetings of experts to analyse the footage.
Mr Bermudez said: “This has been one of the most important cases in my career as director of CEFAA because our committee was at its best.
“I am extremely pleased as well with the conclusion reached which is logical and unpretentious.
“The great majority of committee members agreed to call the subject in question a UAP (Unidentified Aerial Phenomenon) due to the number of highly researched reasons that it was unanimously agreed could not explain it.”
The CEFAA was created on October 3, 1997, by order of General Gonzalo Miranda, the General Director of Civil Aeronautics after several UFO sightings in March and April of that year.