UFO hunters are convinced an alien structure has been discovered in an archive NASA Curiosity Mars rover photo.

Alien life conspiracy theorists have for decades poured-over photographs of Mars, searching for evidence of intelligence extraterrestrials – despite all indications suggesting none exist. However, UFO hunter Scott Waring is among those who remain undeterred.

His latest bizarre claim arrives in the form of an archive panorama taken by NASA’s Curiosity Mars rover.

The NASA-verified, gigapan photo was shot by the space agency’s probe on sol 595, or the 595th Martian day of its mission.

Mr Waring took to his blog ET Data Base to speculate about an oddly-shaped anomaly sitting close to a peak on a desolate Martian hill.

He said: “I was looking over some NASA Mars photos and came across something on a hilltop. A structure.

UFO sighting: The NASA-verified, gigapan photo was shot by the space agency’s probe on sol 595 (Image: NASA)

“Its upper walls were made with horizontal layers, but its doorway was made of vertical layers.

“That shows intelligent design. That is undeniably alien made.”

Mr Waring then used photographic software to estimate the size of his find.

He said: “The structure is about 2m by 2m (7ft by 7ft).

“So the species that made it had to be small enough to go through the doorway, which is about 07.m by 0.7m square

UFO sighting: Waring speculated about an oddly-shaped anomaly sitting close to a peak on a desolate Martian hill (Image: Express)

“As you look at this structure, I want you to know two things: there are lines going vertical and horizontal.

“Now, that should be absolutely impossible. Lines should only go in one direction the rock is forming.

“But here you can see both lines going across and other lines going down.

“This should not be possible but you can see it happening right here – that is just unbelievable.”

Mr Waring added, without offering any evidence, his belief the “structure” was deliberately designed to have a view.