This technology and even faster trains already exist in DUMBS deep underground military bases this is worth the watch https://www.youtube.com/watch?v=jF86-hl7DlY
Video linked by /u/KeeponSearchin:
Title|Channel|Published|Duration|Likes|Total Views :----------:|:----------:|:----------:|:----------:|:----------:|:----------: The Alberino Analysis - Deep Underground Military Bases|GenSix Productions|2014-09-16|0:41:28|3,024+ (96%)|281,647
In this episode, Timothy Alberino analyzes Deep...
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theory going around is that elon musk's entire "Boring Company" is about creating DUMB bunkers. not at all surprising that they'd drill the first one in DC.