Since the 1970s, people across the world have reported a persistent, low-frequency drone that no one else can hear. It causes headaches, nausea, and sleepless nights. Governments have investigated. Scientists have theorized. No one has made it stop.
The comprehensive overview of a phenomenon reported in Australia, Canada, the UK, and the US — a persistent low-frequency humming that only a select few in each location can hear.
A documentary exploring documented cases from Bristol to Taos, interviewing sufferers who describe a sound like a distant diesel engine that never turns off.
What does it feel like to hear a sound that drives you mad while everyone around you hears nothing? This video captures the isolating horror of being a hearer.
The Windsor, Ontario case cracked open: researchers measured an acoustic wave at 35 hertz, potentially traced to an industrial blast furnace across the river.
The most famous case: a joint investigation by the University of New Mexico, Los Alamos, and Sandia National Labs concluded with three words — we have a mystery.
Norwegian researchers tested 28 subjects and found evidence pointing to low-frequency tinnitus — but that only deepens the mystery of why it clusters in certain locations.
San Francisco residents describe their experiences, and acoustic scientists explain why our cities may be generating sounds just beyond the edge of normal hearing.