The Second Narrows Bridge Collapsed on June 17, 1958, tossing 79 workers into Burrard Inlet and killing 18 of them.
Sounded like an explosion:
Some described the noise of the bridge collapsing into the Second Narrows as gunfire or an explosion, others as a rumble or a loud snapping sound. On June 17, 1958 at 3:40 p.m., people from all over Vancouver stopped to listen, as two spans collapsed, tossing 79 workers into Burrard Inlet and killing 18 of them.