this is a modified version of DM_OVERWATCH, the sky is more realistic, 4 new rooms, and 3 teleports (((there is a cousin map called DM_OVERWATCH_RAIN, exact replic but during evening, and has rain)))

PATH
C:\Program Files\Valve\Steam\SteamApps\<YOUR NAME>\half-life 2 deathmatch\hl2mp\maps\