Phil Hoyle, who runs the unit, said: “We are currently investigating numerous sightings that have taken place around Anglesey and, in particular, near Puffin Island.
“Many witnesses, some ex-military and professional people, have witnessed unconventional lights entering or leaving the sea around Puffin Island.”
In January, 1974, a number of people claimed to have seen large, structured objects leaving the sea near the island, and similar sightings have been sporadically reported up to the present day, said Mr Hoyle.
“The people who have contacted us have all been unrelated, but have all told us the same thing,” he said.
“We would be very interested to hear from anyone who might have additional information regarding these as yet unexplained sightings.
“Someone might have seen something last week or seen something 50 years ago, but if other people have seen the same thing it will hopefully make them realise that they’re not crazy.”
Victims of abduction near Shrewsbury were told by the humanoid beings who contacted them that they came from a base under the sea near Puffin Island, said Mr Hoyle.
The area has been suggested as the location of Cantre’r Gwaelod, the legendary ancient sunken kingdom.
Anglesey’s ancient past means the island could be a UFO hotspot, said Mr Hoyle.
“There is definitely a link; we’ve found an 80% increase in UFO activity over ancient sites compared to anywhere else, including Anglesey.”

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