Three tower corridors

The second tower corridor is a room in Metroid II: Return of Samus and Metroid: Samus Returns.

Description
The second tower corridor is located in Area 3 of SR388, and is explored during Samus Aran's mission to exterminate the Metroids. Located deep in the area's lower catacombs, it is the second of three adjacent vertical shafts collectively known as the three tower corridors.

In Return of Samus, the second tower corridor contains one of the Gamma Metroids in Phase 4, as foreshadowed by its Metroid Husk appearing in the first tower corridor. Poisonous plants grow out of the floor and ceiling. If Samus can clear away the plants at the bottom of the tower corridor, she can find a small passage containing a Big Energy Ball, which is very useful for replenishing her energy while hunting Phase 4's Metroids. Ascending the second tower corridor can be tricky due to the very small platforms in this shaft.

In Samus Returns, the bottom of the second tower corridor now leads to a new series of rooms, where the Evolved Gamma Metroid has been moved in this remake. With the improved graphics, it is depicted as a deep cave, with some root-like structures growing on the rock, and Animworms can be seen boring through the earth in the background. There are some artificial platforms and malfunctioning Chozo mech arms, showing that the area was used by the Chozo during their excavation of the planet. A Save Station and Teleport Station are both present, with the latter providing instant teleportation between any other active station on SR388.

Connecting rooms
In both games, the second tower corridor connects (via Charge Doors in Samus Returns) to the first tower corridor on the right and the third tower corridor on the left. In Samus Returns, a Beam Door at the bottom of the second tower corridor connects to a small room leading to the Evolved Gamma Metroid's series of rooms.

Return of Samus

 * 1 Gamma Metroid

Samus Returns

 * 2 Animworms
 * 2 Black Gravitts
 * 2 Chozo mech arms
 * 3 Drivels
 * 1 Electric Moheek
 * 4 Gulluggs

Items

 * Missile Tank
 * In Samus Returns, there is a small Morph Ball maze at the top of the second tower corridor. It is simple to navigate, but Samus needs to use the Beam Burst to destroy a pair of steel orbs blocking the path.