The telegulch.zip file you have requested: Modifications / Map Mods / S to T Titles / Tele-gulch - 5.64mb is not available. Perhaps try browsing all files for the game Halo: Combat Evolved and upload any files you want to share or are missing. This is the only information we could locate:
Telegulch is basically a modded Blood Gulch. It is designed for sniper games, but should work for most others as well. The mods include new teleporters, the entrances are defined by teleporter bases (where you would usually exit the teleporter). An update of the "Blood Gultch" map, customized for better Sniper Games.