|“||I've located a survivor in Room MW toward the rear of the Bioweapon Research Center. Whoever it is will be a key witness. Secure the survivor's safety.||„|
Room MW was a room toward the rear of the Bioweapon Research Center on the BOTTLE SHIP. Commander Adam Malkovich informed Samus Aran about a survivor in the room, wanting her to recover this person. The 'MW' presumably stood for 'Metroid Warriors' as this was where the Queen Metroid was kept and where most Metroid experiments presumably took place (Although the Metroids actually lived in Sector Zero).
The room itself was fairly large with several tanks scattered throughout the room. Along the walls are several smaller rooms with testing equipment inside each one. These rooms could each be locked from the inside.
Samus found the real Madeline Bergman hiding in one of these chambers, keeping the door locked. When Madeline saw Samus, she paniced and moved to a console in the small chamber, releasing the Queen Metroid. After the creature was killed, the room was partially wrecked (From the effects of the Power Bomb used against the Queen) and Madeline's lone hiding place was torn open and she started to run away from Samus, forcing Samus to chase her through Room MW and a few other rooms before finally catching up with her in the control room.