The sleds are pretty cool, so long as you're using them to move people instead of cars. But if they can bring the cost of boring down by a factor of 10, that in

The sleds are pretty cool, so long as you're using them to move people instead of cars. But if they can bring the cost of boring down by a factor of 10, that in and of itself would be a game changer, regardless of what you use the tunnel for.