The distance between Shanghai and San Francisco is around 6,135 miles (9,873 km), and a team of scientists aims to make that trip possible in 100 minutes. Researchers at Harbin Institute of Technology's Complex Flow and Heat Transfer Lab have developed new tech that allows submarines to traveling a crazy-high speeds beneath the water. The solution? Create an air "bubble" of sorts that leverages supercavitation, a technology applied to torpedoes, to reduce drag caused by water while in route. Theoretically, this means that the vehicles could reach the speed of sound underwater (around 5,800km/h or 3,694 MPH while submerged), reducing the travel time between the aforementioned cities to under two hours.