The case of the Wilsthorpe Incident is being investigated after a number of witnesses to the bizarre events along a 25-mile stretch of the East Yorkshire and North Yorkshire coast were discovered.
Witnesses reported seeing strange lights, and odd-shaped craft in an area from Brandesburton in East Yorkshire to Scarborough, North Yorkshire, between May and September 2009.
In some cases UFOs were seen entering the sea, and cars ground to a halt as one appeared, it is claimed.
Two Chinook helicopters full of RAF personnel landed at the beach by the remote hamlet of Wilsthorpe, East Yorkshire, on Tuesday, September 15 2009, at the height of the sightings, paranormal researcher Paul Sinclair has revealed.
It was the day after a bizarre late-night sighting of between 30 and 40 UFOs in the same area by an elderly couple whose home overlooked the beach, he said.
The multiple UFOs sighting followed a spate of other strange UFO sightings along the area of coastline, Mr Sinclair told the Outer Limits Magazine 70 Years of the Modern UFO Era Conference in Hull.
The military action and UFOs were witnessed by the couple, two bait diggers, and a boat worker, a seven-year investigation by Mr Sinclair has discovered.
local newspaper report written more than a week later on September 24 said up to 50 people had seen the military arrival.
The case began in 2009 as Mr Sinclair recorded several UFO sightings in the area on his former website ILF-UFO...
The couple lived in one of 30 flats that overlook the sea at Wilsthorpe.
Mr Sinclair told the conference that the woman described seeing on September 14 2009 15-feet long and eight-feet wide "spaceships over the sea".
He said: "She said there was a huge circle of boomerang-shaped craft.
"She said there were loads - 30 to 40 and the sea below was bubbling, banging and crashing."
The woman said that after about half an hour, the "craft" flew off.
The next day the couple said they saw the military swarming all over the beach.
Mr Sinclair also spoke with a man who runs a bait shop at Bridlington Harbour, who told him his bait diggers had seen "triangle" craft enter the sea in 2009 over the same period.
He said two of his bait diggers had been on Wilsthorpe Beach the day the couple saw the military operation.
They told of seeing "triangles entering the sea" and later "being surrounded by soldiers."
Separately a man working on a boat at Blythe Park boat compound also confirmed the military presence, he said.
Mr Sinclair, who continues to investigate the case, has collated a record of other UFO sightings in the area from at least May 2009 that were either reported in local newspapers or directly to his website.
These include a pink flying saucer and three star-like objects over Flamborough Head, east Yorkshire, on May 10 2009, a huge UFO over Driffield six days later, and a "spherical-shaped craft" seen by nine people at River Head three days after that.
He revealed sightings that continued throughout June and July, including spheres of light over the sea, plus triangle, circular, and egg shaped craft.
Witnesses included trawler men and a retired police officer.
He also had reports of cars stopping working after a UFO sighting, including a black triangular object.
The vehicles worked fine again after the UFO flew out to sea.
These included an off-duty police man driving back from Barmston, East Yorkshire, whose car lights dimmed after a large tube-shaped UFO appeared..
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