the g tech removal from the m 1, m 2 lines, that should be the single detector. that was tape from just a little while ago. those two nasa astronauts out on an emergency space walk to replace a faulty pump. the pump that will coos down the space station. they re now five hours into the mission and these are live pictures. isn t that the extraordinary? that you can actually see that realtime. let s listen in. and three out of four fluid lines now connected to the new spare pump module. we re going to be working with the m 3 line now. what s left is the so-called m 3 line. this is a -ing he can explain what we re actually hearing. what are we in for to see this? is this a difficult mission here. very difficult as you would expect in a situation like this so far above the earth in conditions that are treacherous to say the least. add ammonia to that and you ve