The skyline of Singapore's central business district is seen at dusk as operations continue at a PSA International port terminal in Singapore September 25, 2013. Connected to more than 600 ports in some 120 countries, Singapore is one of the world's busiest shipping hubs, and is often called the gateway to Asia. It plans to increase its total capacity dramatically as it competes with other massive ports in the region such as Shanghai, Hong Kong and Shenzhen in China and Busan in South Korea. Picture taken September 25, 2013.