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Floodwater gushes into a manhole in the middle of a street in Bangkok, Thailand, Saturday, Oct. 29, 2011. Defenses shielding the center of Thailand's capital from the worst floods in nearly 60 years mostly held at critical peak tides Saturday, but areas along the city's outskirts remained submerged along with much of the countryside. (AP Photo/Altaf Qadri)

Floods threaten Bangkok trains

Advancing pools of filthy water threatened the Thai capital's subway system Monday and surrounded the emergency headquarters set up to deal with flooding that has claimed more than 500 lives nationwide.