There’s a Dr Who episode about a civilization trapped in an underground highway with a similar outcome. Update: found it: https://en.wikipedia.org/wiki/Gridloc

There’s a Dr Who episode about a civilization trapped in an underground highway with a similar outcome. Update: found it: https://en.wikipedia.org/wiki/Gridlock_(Doctor_Who) https://en.wikipedia.org/wiki/Gridlock_(Doctor_Who)