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Over the weekend, a team of National Oceanic and Atmospheric Administration ocean explorers came across something seriously unnerving lining the Mid-Atlantic ocean floor: a series of holes dug into the sandy seabed at seemingly regular intervals.

"These holes have been reported from the region, but their origin remains a mystery," reads a post on the team's Facebook page. While they look almost human made, the little piles of debris around the holes make them seem like they were excavated by someone.

The strange holes were bored 1.7 miles below the surface at the crest of an underwater volcano.

There are no clues as to what happened. The ocean floor was not very rough. The depth at which the marks were made suggests that humans are not involved.

The incident shows how little we know about a mountain ridge deep in the ocean.

Seafloor Mystery

The scientists witnessed this strange sight during their voyage to the ridge to get some baseline information about the deepwater areas around the mid-atlantic ridge.

The Mid-Atlantic Ridge is the longest mountain range in the world and one of the most prominent geological features on Earth. Most of it sits underwater and is mostly unexplored.

Definitely Aliens

Several fascinating theories were offered to the researchers as to where the holes might be coming from.

"I think the starfish are doing cartwheels," wrote one person.

I'm not saying it's aliens. It's aliens.

The process of discovery seems to have unlocked new mysteries that the scientists are stumped by.

We are not ruling out cartwheeling starfish as a possible culprit.

They look nearly human made. There are strange lines of holes in the mid-Atlantic floor.

Sailors say the ocean around their ship started to glow.