Trapped Under The Sea is an excellent book written by Neil Swidey that examines the 1999 Boston Harbor tunnel project confined space tragedy. Workers were required to descend 420 feet vertically into a tunnel and then travel 9 miles horizontally through the tunnel to perform work. Amazingly, the workers had to perform the work inside the tunnel with oxygen levels below 10% – clearly unsuitable to sustain human life. Everything had to happen without a hitch for the work to be performed safely. Unsurprisingly, several things went wrong leading to tragedy.

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Jon