The development company FinEst Bay Area Development in Helsinki intends to build a rail tunnel between the Estonian capital of Tallinn and the capital of Finland, Helsinki. FinEst Bay Area Development has signed a 15 billion euros contract for this purpose with the Chinese Touchstone Capital Partners. The intention is to build a tunnel with two tubes under the Gulf of Finland for goods and passenger traffic. With a length of 100 km, this would be the world’s longest subsea tunnel, with two artificial islands provided for emergency exits and ventilation. The travel time between Helsinki and Tallinn through the megatunnel would be reduced from three hours with the ferry to only 20 minutes by train. In a feasibility study from 2018, the costs for the overall project were estimated in a range from 13–20 billion euros.