(NBC News) Two NASA spacewalkers started fixing the International Space Station’s cooling system more quickly than expected on Saturday, with no sign of the helmet-flooding problem that led NASA to outfit astronauts with snorkels for the first time.

Astronauts Rick Mastracchio and Mike Hopkins finished the first of three planned spacewalks in five and a half hours — an hour ahead of schedule. They moved so quickly that they got extra work done, stowing away a coolant pump module with a faulty valve to make room for its replacement. And if their next spacewalk goes as smoothly on Tuesday, they could dispense with the third outing.

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