Disconnection Process News Today

>> reporter: three hours into the sfas wapace walk, the unit place. >> its got to go in another inch or so. >> there you go. >> shes finished. pump module in position. >> reporter: the task is a delicate one. the equipment contains a noxious cooling fluid, ammonia. >> some of the dangers hooking up the big heavy ammonia lines, theyre really thick and massive, and hooking those up of course, if you were to leak ammonia, its not a very pleasant chemical. you couldnt bring it inside. so theres defi...