Entrance condition:

{
  "comeInWithGMode": {
    "mode": "direct",
    "morphed": false
  },
  "comesThroughToilet": "no"
}

Requires:

"h_canNavigateUnderwater"
{
  "or": [
    "canGravityJump",
    {
      "and": [
        "Gravity",
        "canWalljump"
      ]
    },
    {
      "and": [
        "Gravity",
        "canTrickyUseFrozenEnemies",
        "h_canCrouchJumpDownGrab"
      ]
    },
    {
      "and": [
        "HiJump",
        {
          "or": [
            {
              "and": [
                {
                  "notable": "Underwater Walljumps"
                },
                "canUnderwaterWalljump"
              ]
            },
            "canSpringBallJumpMidAir",
            {
              "and": [
                "canTrickyUseFrozenEnemies",
                "canCrouchJump"
              ]
            }
          ]
        }
      ]
    },
    {
      "and": [
        "h_canMaxHeightSpringBallJump",
        "canTrickyUseFrozenEnemies",
        "canBeVeryPatient",
        {
          "or": [
            "canStationaryLateralMidAirMorph",
            {
              "ammo": {
                "type": "Super",
                "count": 1
              }
            }
          ]
        }
      ]
    }
  ]
}

Clears obstacles: B