> You can also fly. Skies are more 3D than digging and easier to access Easier, yes. Cheaper, no. > At some point the holes could cause collapses. The risk i

> You can also fly. Skies are more 3D than digging and easier to access Easier, yes. Cheaper, no. > At some point the holes could cause collapses. The risk is extremely low, and car accidents have caused a vastly greater number of deaths than any other form of transportation. > There's also water mains and other hazards and obstacles. Pretty sure there were some pretty massive hazards with flying too. > Sounds dangerous. Which a lot of people said about flying as well. And it's vastly safer than a car.