Massive 230ft ice chunks collapse at Argentina’s Perito Moreno glacier

The deep cracking sound bursting from within the ice signals the dramatic fall about to happen. Seconds later, a block of ice some 70 metres (230 feet) tall — the size of a 20-story building — collapses from the face of the Perito Moreno glacier into the aquamarine water below. The site has attracted visitors to Argentina’s most famous glacier for years. Standing on platforms facing the ice, they wait for the next crack to split the cool Patagonian air. But recently the size of the ice chunks breaking off — a process called “calving” — has been starting to alarm local guides and glaciologists, already anxious at a prolonged retreat by Perito Moreno.