The crisp captures show two UFOs apparently photographed by Eric Thomason above Maslin Beach in Adelaide, South Australia, Australia, on March 10 1993.

According to Mr Thomason he was looking out to sea, when he saw the UFO rise from the waves and fly towards him. 

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Later, a second, smaller UFO appeared and came to join the first one.

When compared to other alleged UFO images, they were extraordinarily clear.

Mr Thomason told UFO Sweden: "It was then that I saw a development at first glance on the water, and something resembling the tower on a nuclear submarine rose."

Eric ThomasonThe UFOs have been said to be parts of a boat filter.

He even said he feared being abducted after seeing the "craft."

He added: "I had known about individuals being taken by UFOs, so I moved down a slant adjacent area. 

"From that point I could see how the light-dark object came flying to some degree south of me, and stopped over the mine. 

"At that exact second I spotted yet another object, north of the first. 

"That is the point at which I snapped my second picture, yet since the light from the dawn was straight into my view - I moved a little to one side." 

"While taking photos from his spot five metres underneath the highest point of the bluff, the smaller UFO moved towards the bigger one, stopped, and afterward proceeded upwards, into the bigger craft."

Eric ThomasonEric Thomason said two UFOs appeared and the smaller one went into the larger.

Clas SvahnClas Svahn said these boat filter parts resembled the UFO in the pictures.