Sector 2 (TRO)
Sector 2 (TRO) is one of the six sectors aboard the B.S.L Research Station. This sector has a tropical climate houses a large variety of creatures.
Samus later visits TRO while investigating the source of the roots that were cutting off power to the station. There, she is attacked by an SA-X and forced to flee. After defeating Nettori, the source of the roots, Samus acquires the Plasma Beam.