In order to probe the ancient glacier, the researchers had to detonate a series of small explosives in the ice.
The explosions sent shockwaves through the ice, which bounced back from whatever was hidden under the glacier and were later picked up by specialist microphones.
Australian Antarctic Division glaciologist, Dr Ben Galton-Fenzi, said: “These explosions sent out sound waves, which then echoed off different layers in the ice and bedrock.
“We placed geophones along the surface of the glacier to listen to the reflected sound, giving us a picture of what lies beneath the ice.”
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