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Musk is full of ideas and this one seems pretty cool. I'm skeptical of travelling 644 kms in 30 minutes but if anyone could do it, Musk is the guy. Basically it's a capsule shooting through a tube at speed but at over 1,000 km/h. The method to this would be a fan that actively sucks the air from in front of the capsule and expels it behind the capsule but also rides it as part of an air cushion to reduce friction. Pretty cool idea IMO.
Thoughts on this?
PDF file released by Tesla providing some more detail.