““Underhill had an idea for much safer, faster transport than autos or even aircraft. “Ten minutes from Princeton to Lands Command, twenty minutes across the continent. See, you dig these tunnels along minimum-time arcs, evacuate the air from them, and just let gravity do the work.” By Unnerby’s watch, there was a five-second pause. Then: “Oops, little problem there. The minimum-time solution for Princeton to Lands Command would go down kinda deep…like six hundred miles. I probably couldn’t convince even the General to finance it.” “You are right about that!” And the two were off in an extended argument about less-than-optimal tunnel arcs and trade-offs against air travel. The deep tunnel idea was really dumb, it turned out.””
