I think one of my very favorite films of all time was with Peter Sellers when he played Chauncey, the gardener. Being There.
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.
James Ivory comes close to the actors for the first rehearsal. He more or less lets you direct yourself and then will only correct you if he finds it incorrect.

