I was talking to a friends about Countdown (1968) yesterday and after a few minutes we realised he was thinking about another film. Although he was fairly sure it was called countdown too. We talked the plot through and after a while we reckoned it must be this one.
Marooned is perhaps the better known of the two and has if not a similar plot then at least a shared technological peril. Three American astronauts are stranded in space when their retros won't fire. Can they be rescued before their oxygen runs out is the gist of it all.
It's another cautionary tale about the space race, with a countdown to disaster, a lot of melodrama from an equally stunning cast and of course the Russians put an appearance into the proceedings as well.