10 Of History's Deadliest Construction Projects

The Panama Canal opened 100 years ago this month, one of the greatest engineering achievements in history. It was also one of the greatest sacrifices of human life in the name of construction, but tragically, it was far from the most deadly project in modern history.
Here's a sampling of projects - not a complete list - finished since 1900 using numbers reported by McGraw Hill's Engineering News Report, along with the explanations for how record-keepers decided upon those numbers.