Umbilical

Umbilicals are corridors branching out from UNSC Orbital Defense Platforms that serve as docking points for other ships. In Halo Contact Harvest the Jackals on Minor Transgression used it to board Henry (Hank) Gibson's ship This End's Up. Sergeant Avery Johnson used it to chase the jackals before Minor Transgression was destroyed

Cairo Station Umbilicals

During the First Battle of Earth, SPARTAN-117 cleared the portside Umbilicals enroute to the Covenant Bomb in Firing Control. This allowed Commander Miranda Keyes, Johnson, and her Flight Lieutenants to board the UNSC In Amber Clad.