Hyperloop One has released a proposal that will allow passengers to commute 310 miles (500km) between Helsinki in Finland and Stockholm in Sweden in just 28 minutes. Currently it takes around an hour to fly from Stockholm to Helsinki, or a 16 hour ferry journey. The company was among the first to demonstrate its technology for the transport system, dreamed up by Tesla and Space X founder Elon Musk, in a trial in the Navada desert in May.