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Video footage shows pedestrians attempting to sway an Indian suspension bridge in the moments before it catastrophically collapsed, leaving at least 141 people dead as of Monday.
Rescuers expect the death toll to continue to rise after the bridge fell apart in the western state of Gujarat on Sunday. The majority of those killed were women, children, or elderly people, a local official told the BBC. Almost 180 people were successfully rescued, however, in an overnight operation involving national and state disaster relief personnel and the Indian military. Rescuers on boats plucked victims from the dark waters around the bridge and ferried them to the river’s muddy banks, where volunteers and soldiers waited with stretchers to receive the living and the dead.
The 754-foot bridge over the Machchu river, which was built during British rule in the 19th century, had only been reopened for four days after months of repairs when the tragic incident occurred.
When we cross a bridge, we expect it to remain level, but a big enough group of pedestrians can cause a bridge to sway. This happened in 2000 when London’s Millennium Bridge first opened. The sleek suspension footbridge wobbled dangerously underfoot as thousands of pedestrians crossed the river Thames, forcing a shutdown and millions of pounds in alterations.
“We’re trying to accurately describe the magic number of people who can be on a bridge at a time,” he says. Before you hit that crucial threshold, any wobbles on the bridge – say, from wind – would be too small to feel. But when the right number of people are walking across a bridge at the same time, there’s a noticeable jump in swaying.
And once this jump happens, the fact that we all move similarly to stabilize ourselves can make a bridge sway even more. Belykh says people will adjust their natural gait to counteract the motion and stay upright.