The picture was snapped on October 16 by scientists working with Operation IceBridge - a NASA mission that monitors the ways polar regions are responding to climate change.
"That shape is not hugely surprising", said Walker.
We rarely see those ideal edges, he added, because of the "rough and tumble lives" of typical icebergs.
The main berg, dubbed the A68 Iceberg, collided with the Bawden Ice Rise near the edge of the Larsen C Ice Shelf in May this year, causing numerous fractures.
"The iceberg's sharp angles and flat surface indicate that it probably recently calved from the ice shelf", NASA ICE said Wednesday on Twitter.
He says it's a kind of formation called a tabular iceberg. The sea and the wind has not had time to destroy the sharp corners of this block of ice.
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And as with all icebergs only 10% of it is visible; the rest if buried below the surface of the water. The berg is in the shape of an nearly flawless rectangle.
Sometimes, these tabular icebergs are huge in size, measuring hundreds of miles in length and hundreds of feet in height.
These particular icebergs can be truly vast, measuring hundreds and occasionally thousands of square kilometers across, such as the 11,000 square kilometer (4,200 square mile) B-15, the world's largest free-floating object ever recorded.
This iceberg broke off from the Larsen shelf, which collapses on the Antarctic Peninsula, according to Science Alert, according to HB. That image also captures A68 in the distance.
The aim of the survey is to assess changes in the ice height of several glaciers draining into the Larsen A, B, and C embayments.
Such icebergs usually split from the edges of ice shelves, and can have angles close to 90 degrees, provided there is clean calve of the iceberg.