Subventilation Shaft Section B is part of a network of ventilation shafts in the Frigate Orpheon in Metroid Prime that Samus travels through after the Parasite Queen battle in order to escape the frigate. This section contains a swarm of Parasites that are most easily avoided using Morph Ball. The room is inaccessible after the Frigate crashed, due to the fact that the door to it in Cargo Freight Lift to Deck Gamma. is powerless and cannot be reactivated. It cannot be accessed by Subventilation Shaft Section A either, because the door on the other end of that room (connecting it to Biotech Research Area 1) is also powerless and cannot be reactivated.
- Subventilation Shaft Section A (via exploding hatch)
- Cargo Freight Lift to Deck Gamma (leads to Main Ventilation Shaft Section A) (via exploding hatch)