Airlock, or How to Say Goodbye in Space

Airlock, or How To Say Goodbye In Space is a short British science fiction film.

On Christmas Eve, 1976, NASA astronauts Adam Banton Sheen and Carl Ackland Waddington are trapped in a capsule, hundreds of miles from Earth. The two pioneers of the Space Race await the call that will determine their survival. As their oxygen dwindles they receive a transmission from their President. It is not what they expect.

Source: Wikipedia