A couple of UFO experts claimed to have spotted a massive statue of a humanoid creature in one of NASA’s photos of Mars. Based on the image, one of the experts estimated that the alleged statue could be about 700 feet tall.

The mysterious object was first spotted by the YouTube Channel ArtAlienTV. According to the owner of the channel, he came across the photo of the object as he was browsing through Gigapan’s website, which features panoramic images of Mars.

The original photo was captured by NASA’s Curiosity rover on SOL 1419, which is equivalent to the date Aug. 2, 2016. Similar to the other photos taken by Curiosity, the images from SOL 1419 mainly features Mars’ vast landscape and desert-like surface. However, as ArtAlienTV was going through the photo, he spotted a strange object in the distance.

In the Gigapan photo, the mysterious object can be spotted near the upper left corner of the image. Upon zooming in on the object, ArtAlienTV noted that looks like a massive statue that was buried waist-deep in the sand. Based on the object’s appearance, the channel’s owner speculated that it could be about 500 to 700 feet tall.

Scott Waring of the UFO-centered blog ET Data Base identified some of the key features he found on the alleged statue. Based on these features, the subject of the statute could have been a humanoid or an alien creature that has similar physical characteristics as humans.

“It is a huge statue that is half-buried by the sands,” Waring wrote on a blog post. “It’s easy to make out the waist, hips, chest, arms and shoulders. However, the helmet is turned sideways, with its back to us so it’s difficult to see. The helmet also seems to have decoration on it.”

Waring suggested that the ancient aliens on Mars may have built the statue as a tribute to a notable member of their civilization, similar to how humans erect monuments and statues to honor historical figures.

“Just as humans made the faces of presidents on Mount Rushmore in South Dakota...aliens made this statue along the edge of this rocky hillside,” he stated. “This is 100% proof that aliens existed and they looked like us.”

SOL 1419 This image was taken by MAST_RIGHT onboard NASA's Mars rover Curiosity on Sol 1419 (2016-08-03T06:16:11.000Z) Photo: NASA/JPL-Caltech/MSSS