In listening to the Swisher interview, the part I found most exciting was his description of the Boring Company. To summarize first principles on this: 1. Humanity evolved by becoming more densely populated. 2. We achieved that by creating 3D living and working environments. 3. But our urban transportation system is 2D, which has created a bottleneck that will get worse. 4. For 3D transport, we either go in the sky or in the ground, and transporting millions in urban areas in the sky has bad externalities (e.g. visual pollution). 5. The opportunity for 3D transport in the ground is 100 fold. 6. The only constraint to tapping that opportunity is the cost of drilling and constructing tunnels. 7. The solutions to reducing that cost are similar to the issues of space exploration and other transit -- it's all about physics/math/engineering. 8. Musk and his team are among the best in the world in solving these kinds of issues, and they are leveraging their experience in space and ground transit and batteries to solve the tunnel construction challenge. This is huge. Perhaps the biggest impact that Musk will have, among all the great advancements he will be responsible for, is solving the civilization bottleneck of a 2D transport system in a 3D environment.