(CNN) A strikingly rectangular, naturally formed ice sheet has been spotted by NASA during a regular flyover on October 16.

The survey, code-named Operation IceBridge, is designed to watch for changes in the ice levels at several glaciers across Antarctica.

It was during one of these regular surveillance flights that senior support scientist Jeremy Harbeck spotted an unusually angular iceberg floating just off the Larsen C ice shelf.

"I often see icebergs with relatively straight edges, but I've not really seen one before with two corners at such right angles like this one had," Harbeck said in a statement.

From yesterday's #IceBridge flight: A tabular iceberg can be seen on the right, floating among sea ice just off of the Larsen C ice shelf. The iceberg's sharp angles and flat surface indicate that it probably recently calved from the ice shelf. pic.twitter.com/XhgTrf642Z — NASA ICE (@NASA_ICE) October 17, 2018

The picture, shared on NASA's social media account, prompted questions as to whether it was a natural occurrence.

Read More