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