after driving his car off of the rod. they have ruled out drugs or alcohol. two american astronauts on the international spaes station are taking a rare christmas oaf space walk and wrapping up repairs to the cooling system. if all goes as planned repairs will be completed and a third walk unnecessary. phil. reporter: the space walk is about done. 30 more minutes to go and it is successful and unlike the previous two space walks that dealt with dangerous water in the space sought issues. today bone-dry in space. two american astronauts. rick and mike space walked six and half-hours at this point. and will end up doing seven and they are in the home stretch cloning up the work spaces. it is amazing.