Title: Great overview
Product review: Though it's less than an hour, this program provides provides an excellent introductory overview of tunnels, covering their history, functions, design, construction, operation, and risks.The information presented is basic enough for all audiences, yet still has enough depth (pun intended) for engineers who don't specialize in tunneling to also benefit (I have some experience with tunnel engineering myself).I wish the program was twice as long and twice as detailed, but I still enjoyed this and will watch it again.Recommended for all audiences.
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