Prison Break Mode

[Chernobyl]

This idea started out as me telling a housemate how I wanted to make a map that would feature the payers as prisoners of war set to be executed and they have to survive the waves of nords.  Now though, one of his friends suggested that I think about asking for this to be a new game mode.  It would be a break from the normal map survival waves.  Not too sure how to make this mode, but it could be a set of locks that need to be reached to escape to the next section of the map, then the final section being a place with health and ammo that they can defend until boss round.

Any other suggestions would be helpful.  Help me get this idea off the ground!