|Location||Space Jump Room, Maridia|
Space Jump allows Samus to continue her spinjump indefinitely by releasing the jump button and then pressing the jump button again shortly after.
After the peak of a spinjump is reached, Samus will begin descending, and once she has reached a certain vertical speed, she will be able to perform a space jump. If Samus is not underwater, then once Samus has reached a vertical speed value above 2.32768 (pixels.subpixels (per frame)), you will be able to press jump to perform a space jump. If Samus is underwater, then once Samus has reached a vertical speed value above 0.32768, you will be able to press jump to perform a space jump. If Samus reaches maximum vertical speed, you will not have the ability to space jump. Since vertical speed while falling increases at a rate of 0.07168 per frame, the window for being able to perform a space jump outside of water is 23 frames wide, and the window for being able to perform a space jump underwater is 41 frames wide.
As you can see from the above, you can perform space jumps much more quickly underwater, and the window for performing space jumps underwater is substantially larger.
Space Jump will not activate if Samus spinjumps underwater without Gravity Suit equipped, but will activate if Samus exits water during a spinjump and the jump button is appropriately pressed while she is out of the water.
Spinjumping in this context includes walljumping, meaning you can perform Space Jumps out of a walljump, and can conversely Space Jump towards a wall to perform a walljump.
An example of space jumping in Amphitheatre:
An example of Space Jumping underwater in Lava Dive Room:
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