ELI%: I know they were built around 1900, and that the city was not as populated, nor had as many buildings as today. I also know that train tunnels were built with dynamite to get through mountains. But Manhattan is an island. How did they create what is a massive rabbit warren under it? An elderly friend remembers the city taking down the elevated lines in WWII for metal recycling and she swears that the city had a lot more stops as well. Research keeps sending me to three articles, but none of them go into detail. Help please?
In: Engineering
The Sandhogs, the miners union for NYC, has been features in many interesting [documentaries](https://www.youtube.com/watch?v=gnwA0-9z9ho ). It’s a seriously dangerous profession, using explosives underground.
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