The Crew Dragon capsule which will carry four NASA astronauts next month saw unexpected erosion to the heat shield and has already been replaced with 'better material'
Musk eventually wants all vehicles to be fully autonomous with no human intervention and sees the twin tunnel system of Las Vegas Loop as a solution with electric vehicles running at around 150 mph
With 5G, advanced satellite communication and integration of artificial intelligence and robotics, the future defense system may need minimal human intervention.