This is a long climb, and getting around the fish under the missiles can be tricky or slow. Place bombs against the speed blocks until they are overloaded. Afterwards, freeze a crab on the edge of the speed blocks, such that Samus can jump inside and stand on the crab. Exit G-Mode and rotate to obtain the item, then kill the crab with Wave Beam to fall back down.

Entrance condition:

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

Requires:

{
  "notable": "G-Mode Overload Speed Blocks then use Frozen Crab"
}
"h_canArtificialMorphIBJ"
"Gravity"
"canTrickyUseFrozenEnemies"
"Wave"
{
  "or": [
    "h_canArtificialMorphJumpIntoIBJ",
    {
      "and": [
        "h_canArtificialMorphSpringBall",
        "HiJump"
      ]
    },
    {
      "and": [
        "h_canArtificialMorphSpringBall",
        "canGravityJump"
      ]
    },
    "h_canArtificialMorphDoubleBombJump",
    "h_canArtificialMorphStaggeredIBJ",
    "canBeVeryPatient",
    "h_canArtificialMorphPowerBomb"
  ]
}
{
  "or": [
    "h_canArtificialMorphSpringBall",
    "h_canArtificialMorphCeilingBombJump",
    "canBeVeryPatient"
  ]
}