3 ms·Elon Musk talking about 3D Tunnels1 points by praving5 9y agodwringer 9y agoThe real question on everyone's mind is when he's gonna start talking about his 4D ones.praving5 9y agopretty soon :)praving5 9y agoI don't know where he gets this "rich" ideas from? I mean either he is watching a lot of cartoon movies or reading lot of fiction.