Chennai Port, formerly known as Madras Port, is the second largest container port of India, behind Mumbai's Nhava Sheva. The port is the largest one in the Bay of Bengal. It is the third-oldest port among the 13 major ports of India with official port operations beginning in 1881, although maritime trade started much earlier in 1639 on the undeveloped shore. It is an artificial and all-weather port with wet docks. Once a major travel port, it became a major container port in the post-Independence era. The port remains a primary reason for the economic growth of Tamil Nadu, especially for the manufacturing boom in South India, and has contributed greatly to the development of the city. It is due of the existence of the port that the city of Chennai eventually became known as the Gateway of South India. The port has become a hub port for containers, cars and project cargo in the east coast of India. From handling a meagre volume of cargo in the early years of its existence, consisting chiefly of imports of oil and motors and the export of groundnuts, granite and ores, the port has started handling more than 60 million tonnes of cargo in recent years. In 2008, the port's container traffic crossed 1 million twenty-foot equivalent units (TEUs). It is currently ranked the 86th largest container port in the world and there are plans to expand the capacity to about 140 million tonnes per annum. It is an ISO 14001:2004 and ISPS-certified port and has become a main line port having direct connectivity to more than 50 ports around the world.