Entrepreneur Elon Musk proposes Hyperloop : shooting travelers through tubes . Musk 's idea is aimed at allowing people to travel from San Francisco to Los Angeles in 30 minutes . Score: But the program 's initial projected cost of $ 34 billion has ballooned to $ 118 billion . 7 Ideas include scramjets , bullet trains and driverless cars .
Entrepreneur Elon Musk proposes Hyperloop : shooting travelers through tubes . Musk 's idea is aimed at allowing people to travel from San Francisco to Los Angeles in 30 minutes . Score: 7 Ideas include scramjets , bullet trains and driverless cars .