Iceberg

In the 20th century, several scientific bodies were established to study and monitor the icebergs. The International Ice Patrol, formed in 1914 in response to the Titanic disaster, monitors iceberg dangers near the Grand Banks of Newfoundland and provides the "limits of all known ice" in that vicinity to the maritime community.
In March 2008, a chunk of Antarctic ice, about seven times the size of Manhattan, suddenly collapsed, putting an even greater portion of glacial ice at risk, and an ice shelf about the size of Connecticut was "hanging by a thread" as of March 25, 2008.