A sinkhole the size of a backyard swimming pool has opened up in Sydney's exclusive eastern suburbs, blocking traffic, cutting power and interrupting personal training sessions.

As emergency services worked to control the spread of the hole in the harbourside suburb of Point Piper, where the prime minister lives, Kirsty Mirzikinian and her personal trainer watched in disbelief. “Honestly I’m in shock. I’m in shock right now because I’ve come home and there’s a massive hole…