Farewells (1966)

The captain of a ship in port has been entrusted with a secret government mission. He gives leave to the crew, but orders them to report back each morning. As the days go by, and the sailing date still remains a secret, the crew are thrown into a state of increasing uncertainty. The film concentrates on two crew members whose experiences are coloured by the omnipresent reality of the ship which is about to depart.

Unfortunately the movie Farewells is not yet available on HBO Max.