Known as a tabular berg, the massive block of ice is thought to measure one kilometre long.
Scientists are now taking part in an airborne survey of Earth's ice as part of what is known as Operation IceBridge.
Operation Icebridge use a highly specialised fleet of research aircraft to capture the images.
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.More news: Cracksman blinkered in Champion Stakes
Sea ice comes in many types and forms, depending on the stage of development and the meteorological, atmospheric, and other physical conditions.
Scientists took the snap from a plane used to monitor changing land and sea ice in the South Pole.
Although it's often said that there are no straight lines or flawless 90-degree angles in nature, they do happen, albeit rarely.
Tabular icebergs, such as the two discovered recently, are typically flat and wide, and very large in length.
The iceberg's unique geometric shape sparked considerable debate on social media that it was formed by - you guessed it - space aliens.More news: No room for extravagance at low-priced Premier Inn
The most familiar are those that look like prisms, such as the one that sank the Titanic.
"And then you have what are called 'tabular icebergs.'" Kelly Brunt, an ice scientist with NASA and the University of Maryland, told Live Science.
The unusual mass, known as an angular iceberg, was spotted during a flyover of the east coast of the Antarctic Peninsula.
"Some of the resulting fragments will have right angles, but many will not as the imagery shows from the general area of the collision between Bawden and the western end of A-68A".More news: Mission to Mercury blasts off