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However, according to NASA, there's a simpler scientific reason why the iceberg appears to be a ideal rectangle.

The cake-shaped iceberg was photographed on October 16 by NASA's IceBridge program, which routinely flies planes over the poles to take photos and study how these remote locations are changing.

Most people think of icebergs as jagged, frozen mountains with only a fraction of their bulk sitting above the surface of the water, but it turns out that there's actually two kinds of icebergs: tabular and non-tabular. In fact, most icebergs look something like this initially; it's only after the iceberg melts and breaks apart that they become the irregular-shaped icebergs we're more familiar with. Not all of them are rectangular-some have jagged borders like a puzzle piece, but most of their sides are sheer and smooth (at least at first).

The mysterious slab-like iceberg, up to a mile wide, was spotted near the Larsen C ice shelf, and the sharp angles hint that it broke off very recently.

And as with all icebergs only 10% of it is visible; the rest if buried below the surface of the water.

Nasa had found a piece of floating ice in Antarctica that is so flawless, it looks like it was deliberately cut.

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"The 'bergs detaching from Larsen C are so big, they look perfectly rectangular or with linear features because they were created from rifts that run across the ice shelf for hundreds of kilometres straight", he notes.

There has been suggestion that the iceberg could have broken away from the shelf as a result of global warming.

"A tabular iceberg can be seen on the right, floating among sea ice just off of the Larsen C ice shelf", NASA's department of cryospheric sciences tweeted. Larsen A collapsed in 1995, and Larsen B collapsed in 2002. This iceberg is probably very new, since its sides are still smooth and nearly perfectly vertical.

Satellite images showing the 2008 Wilkin's Ice Shelf collapse.

The calving of the huge iceberg reduced the size of the ice shelf by 12%.