A long time ago, the possibly early 80s I remember seeing a film, it was black and white, from my memory the cars in it were quite old fashioned to 40/50s style cars.
I believe the characters were in an undersea base or tunnel. They were trying to escape from flooding. I remember flood doors being closed and water rushing in with the characters trying to escape.
I remember there being futuristic (from the point of view of the film) elements, with electric valves etc.
The tunnels were not round, floors and walls were all vertical.
That is about all I can remember, but any specific questions may jog my memory.