Travel from Shanghai to San Francisco in less than two hours! Yes, as researchers from the Harbin Institute of Technology in China claim that with their ongoing research work, one day, they will be able to develop submarines capable of traveling very fast.
The technology that they will be using in these super-fast submarines is called supercativation. The extremely fast speed can be achieved by encapsulating the entire submarine in a gas bubble emitting from its nose. This bubble would result in lack of friction which will ensure a very high speed.