No one is fit to judge a book until he has rounded Cape Horn in a sailing vessel, until he has bumped into two or three icebergs, until he has been lost in the sands of the desert, until he has spent a few years in the House of the Dead. ↗
Ice shelves in general have episodic carvings and there can be large icebergs breaking off - I'm talking 100km or 200km long - every 10 or 20 or 50 years. ↗