Dotted all along the Sydney coastline, from Palm Beach in the north to Cronulla in the south, are about 35 ocean pools — but not a single one has been carved out since the 1960s.
Who built these pools shaped by the natural rockface of the city's beaches, and why aren't they still being built?
That's the question Curious Sydney has been asked to investigate by Krissy Varga, a swimming teacher and long-distance swimmer originally from Hungary.
"I started wondering — because I have been all around Australia as a tourist — why other cities haven't got this many ocean pools," she said.