Crater Tunnel B
Crater Tunnel B is a room in the Impact Crater region of Metroid Prime. It is the room before the encounter with Metroid Prime.
Exo Skip
Exo Skip is a trick discovered by gdVertigo. By luring a Metroid into the room, you can clip out of bounds if the Metroid is positioned properly and the Samus rolls into the corner at the appropriate time. This trick allows you to skip the Exoskeleton Phase of Metroid Prime.