WHAT WAS CLAIMED
The Sydney Opera House is sitting on top of a huge subterranean structure.
OUR VERDICT
There's no underground structure below the Opera House and an image claiming to show this appears to be AI-generated.
AAP FACTCHECK – A viral picture of the Sydney Opera House showing a sprawling subterranean complex extending deep beneath is a digitally generated fake.
Facebook users have been sharing the image, with captions such as: "Underneath the Sydney Opera House."
The image is clearly fake, with plenty of commenters poking satirical fun, but many non-Aussies do seem to be falling for it, with comments such as "Awesome venue, Every floor entertaining" or "Isn't it amazing? This is one visit I'd love to make".