http://www.newsweek.com/nasa-releases-photo-second-weird-rectangle-iceberg-near-larsen-c-ice-shelf-1188686

Icebergs don’t often make international headlines, but an oddly perfect-looking and seemingly anomalous rectangular structure in the Antarctic did just that this week. But the iceberg wasn't that special after all, according to the photographer of the first image who has shared a second showing a similar object floating nearby. 

The arm of NASA which documents ice tweeted an image of what is known as a “tabular iceberg” near the Larsen C ice shelf, off the east coast of the Antarctic Peninsula, on 17 October.