I never googled that so I assumed it was fundamental design failure or minor problems grew out of control over time or bad maintenance or some combination. This blows my mind: "a failure triggered by a flaw just 0.1 inches (2.5 mm) deep."

Silver Bridge

On December 15, 1967, the Silver Bridge collapsed amid heavy rush-hour traffic, resulting in the deaths of 46 people, two of whom were never found. Investigation of the wreckage soon pointed to the failure of a single eyebar in one of the suspension chains as the primary cause — a finding noted in a preliminary report released within 10 months of the collapse. However, to explain why that eyebar failed — a failure triggered by a flaw just 0.1 inches (2.5 mm) deep, which led to a fracture — required significantly more time and effort to uncover, with the final accident report taking three years to complete. The collapse led to significant changes in the way bridges in the U.S. are inspected and maintained.

I watched The Mothman Prophecies last month. I didn't like it much. It was too much drama and not enough horror. But the sound design was great and it was the creepiest part of the movie.