The arena_01.zip file you have requested: Maps Levels Missions / Arena 01 - 3.26mb is not available. Perhaps try browsing all files for the game Enemy Territory: Quake Wars and upload any files you want to share or are missing. This is the only information we could locate:
This map is designed for just a few people. There is no objective. No Health Packs. No Radar. No Artillery. Just kill each other.