Astronauts Begin Space Station Repairs First of multiple spacewalks needed is underway By Newser Editors, Newser Staff Posted Dec 21, 2013 9:46 AM CST 5 comments Comments In this image from NASA, astronaut Rick Mastracchio performs a spacewalk outside the International Space Station. (AP Photo/NASA) (Newser) – Two US astronauts are in the midst of the first of two and perhaps three spacewalks needed to repair the cooling system of the International Space Station, reports AP. Rick Mastracchio and Michael Hopkins will work on the faulty pump today, Monday, and again on Christmas Day if necessary. You can watch the spacewalk live here via Space.com. Also of note today: The pair have what the New York Times calls "makeshift snorkels" to allow them to breathe in the event of a suit malfunction like this one in July.