Umbilical
From Halopedia, the Halo wiki
Umbilicals are corridors branching out from UNSC geosynchronous Super MAC platforms like Cairo Station to other ships that may dock to the station.
Cairo Station Umbilicals
During the First Battle of Earth, the Master Chief cleared the portside Umbilicals for Commander Miranda Keyes' safe passage to In Amber Clad before moving on to MAC firing control to get to the Covenant Bomb. Template:Cairo Locations
