Entrance condition:

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

Requires:

"canComplexGMode",
"h_navigateUnderwater",
{"or": [
  {"and": [
    "Gravity",
    {"or": [
      "canGravityJump",
      "canWallJump",
      "SpaceJump",
      "HiJump",
      "canSpringBallJumpMidAir",
      {"and": [
        "canTrickyUseFrozenEnemies",
        "h_underwaterCrouchJumpDownGrab"
      ]}
    ]}
  ]},
  {"and": [
    "HiJump",
    {"or": [
      {"and": [
        {"notable": "Underwater Walljumps"},
        "canUnderwaterWallJump"
      ]},
      "canSpringBallJumpMidAir",
      {"and": [
        "canTrickyUseFrozenEnemies",
        "h_underwaterCrouchJump"
      ]}
    ]}
  ]},
  {"and": [
    "h_underwaterMaxHeightSpringBallJump",
    "canTrickyUseFrozenEnemies",
    "canBeVeryPatient",
    {"or": [
      "canStationaryLateralMidAirMorph",
      {"ammo": {"type": "Super", "count": 1}}
    ]}
  ]}
]}

Clears obstacles: B