12

Kill, freeze, or dodge the Yapping Maws. Kill the Zoa and wait for its drop to disappear. Just before it disappears, move into the sand and crouch. Press forward when near the transition to stand up and touch the transition on the first frame of standing. If the drop is an ammo drop, Samus can collect the drop and not have to wait for it to respawn. To do this, sink slightly into the sand before collecting the drop, then crouch and stand up to touch the transition and get hit by the Zoa. Note that if the Yapping Maw grabs Samus after touching the transition, the G-mode setup can still work.

Requires:

"h_navigateUnderwater"
"canPlayInSand"
"canDownwardGModeSetup"
{
  "or": [
    "Ice",
    {
      "ammo": {
        "type": "Super",
        "count": 1
      }
    },
    {
      "obstaclesCleared": [
        "A"
      ]
    },
    {
      "obstaclesCleared": [
        "B"
      ]
    },
    "canTrickyGMode",
    {
      "and": [
        "canInsaneJump",
        {
          "or": [
            "Gravity",
            "HiJump",
            "canWalljump",
            {
              "and": [
                "h_underwaterCrouchJumpDownGrab",
                {
                  "doorUnlockedAtNode": 1
                }
              ]
            },
            {
              "and": [
                "h_underwaterCrouchJumpDownGrab",
                {
                  "doorUnlockedAtNode": 3
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}

Exit condition:

{
  "leaveWithGModeSetup": {}
}

Unlocks doors:

{"nodeId":1,"types":["super"],"requires":["canTrickyJump"]}
{"nodeId":1,"types":["missiles","powerbomb"],"requires":["never"]}
{"nodeId":3,"types":["super"],"requires":["canTrickyJump"]}
{"nodeId":3,"types":["missiles","powerbomb"],"requires":["never"]}