To install this map properly so you can play it in Half-Life 2 Deathmatch, you're going to want to extract the zip into the following directory:

"C:\Program Files\Valve\Steam\SteamApps\USERNAME\half-life 2 deathmatch\hl2mp\"

Of course, if you installed Half-Life 2 in a different directory, you'll be extracting into a slightly different directory. Additionally, instead of "USERNAME" you should substitute what user name you're using for Steam.
- Singe

note of credit: The first music is from Dieselboy's CD "The Dungeonmaster's Guide" and is the second half of "The Hand" by Technical Itch mixed into the first half of "Infection" by E-Sassin. The music at launch is a cropped version of Juno Reactor's "War Dogs". The music at the very end is related to Ziel 100 in some way but I'm not sure what it is since it's a very short incomplete download I've had for years and could never find a longer copy of. :) The metal sphere model is made by Gobanzo Mon, and the "pk01" custom textures are made by the brilliant Philip K. The rocket launch sound I use I found in some guy's online portfolio, so don't credit me for it! Oh, and the skybox is custom and I found it on Source Prefabs before the site went down. Incidentally, the layout of this map is a rough approximation of a Cold War era Titan 2 ICBM missile silo. :)