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Brinstar Depths (called Brinstar Depths (Melee) in Brawl) is the name of the theme that plays on the Planet Zebes: Brinstar Depths stage in Super Smash Bros. Melee, which was originally a remix of the Kraid's Lair theme from Metroid. The remixed theme includes bubbling effects as well as the Elevator/Chozo Statue room theme. The song was retained in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS and Wii U, though its accompanying stage was not. For these two reappearances the song was moved to Planet Zebes: Brinstar.
The original theme can be heard here:  The PAL version of the game used a slower, darker version of the theme, which can be heard here starting at 2:22 . The theme from the remake Metroid: Zero Mission can be heard here: , the theme from Melee here: , and Brawl here: .
In the instrument trivia of Jam With the Band, Brinstar Depths plays when the vibraphone is selected.