Underdam was supposed to be the extension to dm_basebunker but because there were too many elements in one map, I divided it into two maps.
I originally did not want to release Underdam on Gamebanana right after it was done because it was a quick map I did and did not stand a chance against Basebunker. Since some time has passed and for some reason the .vmf vanished because OneDrive decided to not sync my files with the cloud anymore (thanks M$), I now release it on Gamebanana.
It was first featured on match servers but ultimately, I ended up thinking it best suits public servers, so have at it.
Excellent map, as usual. The HL2 ambient is perfectly reproduced, with abundant and precise details. There's just a little bug, at least on my system, but I think it's a limit of the engine, not an error of the map: the water, sometimes, casts bad reflections. Some screenshots included to explain the problem.