The Big Dig Slurry Walls, Frozen Ground and an Epoxy That Crept

For about two decades, Boston built a new highway underground while the old elevated one carried traffic above. This film explains slurry walls, frozen ground, tunnel boxes, immersed tubes, leaks and the 2006 ceiling collapse investigation. Chapters 0:00 The ceiling 1:19 Why Boston dug 3:05 Slurry walls 5:38 Frozen ground 7:28 Immersed tubes 9:33 Water and leaks 11:34 Epoxy creep 17:14 Repairs and lessons Visuals are illustrations and explanatory diagrams created for this video, not original footage.