Pause and jump just before the fade out finishes. Turn off Spring Ball and place a Bomb just above where Samus' head would be if standing. Pause again between 23-25 frames later and equip Spring Ball; Samus has a three frame window where she has upward momentum from the Bomb and can jump again. The positioning of the Bomb is quite lenient, with an 11 frame window for where it can be placed. This needs to be done twice to cross the room and get through the morph tunnel.

Entrance condition:

{
  "comeInWithGMode": {
    "mode": "any",
    "morphed": true
  }
}

Requires:

"h_canArtificialMorphUnderwaterBombIntoSpringBallJump"