This rooms only purpose is to serve as an access to the Concourse from Zipline Station Delta. This room is littered with small Space Pirate Crates. There is also a Databot that Samus can scan for the Lore scan "Loss". The first time Samus enters Concourse Access B there will be no inhabitants. If Samus visits the room a second time, a Phazon Metroid can be found.
- "It was approximately 5 months ago that our systems detected a meteor-like object collide with a planet in a nearby galaxy. The impact was followed by a spreading corruption identical to the one we saw devour our creators' planet. More so than ever, we were determined to aid the Aurora and discover the source of these objects. Months passed before we could uncover its origin-it had come through a wormhole from an incredibly distant planet. We studied this link between the tear in space and the location it was connected to. As we delved deeper it became clear that this was the mysterious planet the Chozo Searcher had been seeking. The living planet was aggressively attacking the other worlds, hurtling parts of itself across the cosmos like missiles. We had finally discovered the source of these corrupted meteors. It was about one month ago that we made our revelation, but all attempts at transmitting the critical data to the Federation were unsuccessful. It appeared that the Aurora Unit had become disabled. We tried desperately to restore the Aurora but, it had been corrupted by an unknown virus. Our only means of communication with the Federation was severed."