Water-filled tank


 * Not to be confused with the Water Tank in Sector 2 / Cryosphere.

The water-filled tank is a long room in Sector 1 / Biosphere. It appears in Metroid: Other M. This room is entered shortly after Samus defeats the King Kihunter in the Biological Experiment Floor.

Description
The room is primarily filled with water, hence the name. Navigation of the water is made more dangerous on the first visit due to the Gravity Feature not being authorized. Whether this room has always been flooded is unknown, though the damage to it, and presence of human architecture in the submerged area imply that it was not.

On the first ledge, and at other points in the room is a ventilation shaft in the wall, through which thick green vines or roots have burst and grown over the room. These vines end in the water. A railing for a sliding platform is present here, although the platform is on the other end of the room. Also under the water are three port holes and noticeable cracks and rubble on the floor. Vines are found growing out of two of these, two more remain intact, and a Whipvine covers the last; when killed, the tunnel can be entered (see the Items section below). A grating for the hole lies on the floor directly under the Whipvine, suggesting it emerged from the tunnel and knocked the cover off.

At the back end of the underwater tank is a grate directly in front of Samus, and a side room with a faint red light and a sensor. When Samus shoots the sensor, the sliding platform moves to the front of the room. Samus can then use it, but has to shoot three Whipvines in Search View while on it to avoid them knocking her off the platform. Once she reaches the rightmost ledge, she is free to continue onto the next room.

Connecting rooms
The water-filled tank connects to an L-shaped corridor that has suffered significant damage and has vines growing in it, with massive boxes in the way. Samus exits the water-filled tank into an open room that also contains water, as well as a number of Bulls.

Inhabitants

 * 4 Skulteras
 * 4 Whipvines (1 is underwater, the rest are on the ceiling)

Items

 * Missile Tank 1:Samus must kill a Whipvine underwater, and then roll into the small tunnel behind it. The tank is here.
 * Missile Tank 2:Requires the Speed Booster and Gravity Feature. On her return to the BOTTLE SHIP, Samus can now run at full speed through the gate on the far wall underwater, to reach this tank.