gm_constryard.
From Half-Life 1: The Specialists.
gm_constryard
Features
Navigation Mesh + Ai Nodes
This map was designed for The Specialists, a mod Half-Life. The game became quite popular around 2003 and 2004 and had some pretty amazing special effects for GoldSrc, specially the bullet time effect which worked really well for a multiplayer game of the era.