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Workers carry out the "tile-tapping' test" at the Sydney Opera House, April 5, 2022, Sydney, Australia. Every five years maintenance workers spend six weeks inspecting a tap test on each tile on the sails of the Sydney Opera House. (Photo/VCG)
A worker carries out the "tile-tapping' test" at the Sydney Opera House, April 5, 2022, Sydney, Australia. Every five years maintenance workers spend six weeks inspecting a tap test on each tile on the sails of the Sydney Opera House. (Photo/VCG)
A worker carries out the "tile-tapping' test" at the Sydney Opera House, April 5, 2022, Sydney, Australia. Every five years maintenance workers spend six weeks inspecting a tap test on each tile on the sails of the Sydney Opera House. (Photo/VCG)
A worker carries out the "tile-tapping' test" at the Sydney Opera House, April 5, 2022, Sydney, Australia. Every five years maintenance workers spend six weeks inspecting a tap test on each tile on the sails of the Sydney Opera House. (Photo/VCG)
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