A haunting sound captured by researchers could help monitor changes to Antarctica’s Ross Ice Shelf from afar. Extremely sensitive sensors were buried two metres under the surface to capture ‘seismic motions’. Winds blowing across the icy surface create vibrations, producing a ‘near-constant set of seismic tones’, according to the study in Geophysical Research Letters. The frequency is too low to be heard by human ears and, according to the American Geophysical Union, it was only made audible by speeding up the recording about 1,200 times