The quest to solve the mysterious ‘eerie’ hum of the Golden Gate Bridge

Engineers are working on a plan to quiet the unbearable' sound, which occurs when strong winds hit the bridge

Somewhere in a wind tunnel on the south-western side of Ontario, a group of the world's leading bridge aerodynamics and acoustics experts are puzzling over a full-scale model of the railing of the Golden Gate Bridge.

The experts have been contracted to solve the mysterious problem of a strange humming sound that has been emanating from San Francisco's famous bridge for the past year, driving some nearby residents to a state of madness.