I'm trying to identify a film which shows a group of East Berlin folk trying to tunnel under the wall and escape to the west. I can't remember the name or any actors in the film as it was one I watched in my childhood.
I remember the near the end of the film, the tunnel collapses and some of the people die or get caught on the east side. I think the tunnel started in a warehouse from memory and part of the tunnel was under a large puddle which eventually caused the roof to collapse.
Any help would be greatly appreciated!

Many thanks,
Matt

Possibly Escape from East Berlin or Berlin Tunnel 21 or The Tunnel. If not, approximately what decade was it made?

Many thanks. It was an 80s film so probably Berlin Tunnel 21. Thank you.