The Wuhan Metro is the rapid transit system serving Wuhan, the capital of Hubei Province in central China. Construction began in 2004, and the first section of Line 1 opened on July 28, 2004, making Wuhan one of the first cities in central China with a modern metro system. The network expanded rapidly with new lines crossing the Yangtze River and connecting the city's main districts. Line 2, opened in 2012, was the first metro line in China to cross a major river through an underwater tunnel. Today, the Wuhan Metro has become a major part of the city's public transport network, with numerous lines serving millions of passengers every day.