The green liquid is nowhere to be seen in Super Metroid. This same substance is present onboard Sector 1 (SRX) of the BSL station, in the Tourian-like area before fighting Neo-Ridley. It is most likely some sort of waste from the now inactive power systems in the destroyed area. It is unknown what the substance is or how it appeared, but it is harmful even with the protection of the Gravity Suit. This is later explained by Metroid: Zero Mission when Samus first enters Tourian, a cutscene shows a Metroid outbreak has occurred, killing all Pirate personnel in-game, many corpses of Zebesians can be seen throughout Tourian.Īfter the defeat of Mother Brain, a Time Bomb incinerates the facility and reduces it to ruins, causing an acid waste to leak afterwards, which can be witnessed in Zero Mission if Samus returns after obtaining the Fully Powered Suit. Surprisingly, while this is indeed the main HQ of the Pirates and is therefore also known as their central base, there are none of the marauding race to be seen in the original Metroid. The first Tourian was originally built by the Chozo, with modifications and additions being made to it by the Space Pirates after the former abandoned Zebes and/or were exterminated by the latter. A map of Tourian in Metroid: Zero Mission.
