Kill the Choot at the bottom of the room. Freeze the two Zebs to create a runway to shinecharge with. Pixel perfect freezing of both Zebs provides the longest runway, but a slightly higher position of the second Zeb is still usable. Slide off the end of the runway while gaining a shinecharge. After landing on the center pedestal, do a short spin jump to the right, turn left, fire shot to break spin and collect the item. After the message box closes, depending on Samus' position, hold left and wait a moment to let Samus move down-left a few pixels before activating a diagonal spark.

Freezing just a single Zeb is also possible but requires a 13-tile shortcharge.

Requires:

"h_trickyFrozenEnemyRunway"
{
  "notable": "Double Frozen Zeb Runway"
}
{
  "notable": "Double Frozen Zeb Item Collect Shinespark Escape"
}
"canShinechargeMovementTricky"
{
  "canShineCharge": {
    "usedTiles": 19,
    "openEnd": 1
  }
}
{
  "shinespark": {
    "frames": 20,
    "excessFrames": 11
  }
}
{
  "or": [
    "canWalljump",
    "HiJump",
    "SpaceJump",
    "canIBJ",
    "canSpringBallJumpMidAir",
    "canSpringBallBombJump",
    {
      "and": [
        "canCrouchJump",
        {
          "notable": "Precise Crouch Jump Down Grab"
        }
      ]
    }
  ]
}

Collects items: 3

Getting out with only Gravity and no wall jump requires a tight crouch jump and down grab while above the water: Position very close to the edge, and press forward immediately after crouch jumping (almost simultaneously).

Requires:

{
  "notable": "Precise Crouch Jump Down Grab"
}
"Gravity"
"canTrickyJump"
"h_crouchJumpDownGrab"

Requires:

"h_storedSpark"
{
  "or": [
    {
      "shinespark": {
        "frames": 32,
        "excessFrames": 13
      }
    },
    {
      "and": [
        {
          "shinespark": {
            "frames": 15,
            "excessFrames": 12
          }
        },
        {
          "notable": "Precise Crouch Jump Down Grab"
        },
        "canTrickyJump",
        "h_crouchJumpDownGrab"
      ]
    }
  ]
}