Main Hydrochamber is a room in the Torvus Bog in Metroid Prime 2: Echoes. This is the room where the Alpha Blogg is fought. A pillar exists in the middle of the room, destroyed when the Alpha Blogg descends. Several ledges in the room exist and can be reached with the Gravity Boost. There are also Spider Ball Tracks up against a wall leading up to a Portal.

The Dark Aether version of this room was the Undertemple.

Connecting rooms[]


Second visit[]

Alpha Blogg (after obtaining the Gravity Boost)
"Morphology: Alpha Blogg
Immense Blogg pack leader.
Enormous water dweller will fire sonic disruption blasts at foes. It has all strengths and weaknesses of its brethren."

Later visits[]

2 Blogglings
"Morphology: Bloggling
Youthful, aggressive Blogg.
Violent infant creature. Will use a ram attack if provoked."


Spider Ball Track (before obtaining Spider Ball)
"Magnetic rail system track detected.
Rail system powered and active. Spider Ball technology required to access track."
Spider Ball Track
"System: Spider Ball Track
Magnetic rail system track.
In Morph Ball mode, press and hold R* when close to this type of surface. Use Control Stick to move the Ball along the track. Release R* to disengage from the surface.
CAUTION: A Morph Ball Bomb will briefly disengage the Ball from the track."
Dark Portal (inactive)
"This rift portal is inactive.
The portal field can be energized with dark energy. Walk into an energized portal to transport to Dark Aether."
Dark Portal (active)
"This portal is active.
Walk into the portal to transport to Dark Aether. Extreme caution recommended once transit is complete."