The Mount Isa Underground Hospital was constructed in the grounds of the Mount Isa District hospital by off duty miners from Mount Isa Mines. It was thought that Mount Isa was a strategic target after the war in the Pacific reached the shores of Australia in February 1942.
The drilling, blasting and clearing out of the tunnels was mostly done over a two week period in March/April 1942 during which time approximately 100m of tunnel was excavated. There are actually three parallel tunnels which amount to roughly 20m square of space. They are call the Onton Tunnels after Wally Onton who was the underground foreman who supervised the contraction of the tunnels.
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| Deb, John and Nick at the one of the tunnel entrances |
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| John, Deb, Robert, Nick and Carol |
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