Enter the room while building a shinespark and use it on the lowest part of the ramp to cross the room and reach a raised ledge on the right side wall. From there, use SpaceJump to escape the water. Carry the shinespark to the bottom of the ramp by delaying the first Choot with two Power Beam shots, killing it, or bounceballing through it. The Choot can be shot diagonally from the middle platform, and again by running off that platform and aiming down to float above it.

Entrance condition:

{
  "comeInShinecharging": {
    "length": 6,
    "openEnd": 1,
    "steepDownTiles": 1
  }
}

Requires:

"canShinechargeMovementComplex"
"canCarefulJump"
{
  "or": [
    {
      "and": [
        "canMidairShinespark",
        "canDodgeWhileShooting"
      ]
    },
    {
      "and": [
        {
          "enemyDamage": {
            "enemy": "Choot",
            "type": "contact",
            "hits": 1
          }
        },
        "canNeutralDamageBoost",
        "canBounceBall"
      ]
    },
    {
      "and": [
        "canMockball",
        {
          "or": [
            "canPseudoScrew",
            "ScrewAttack",
            "Plasma",
            "Wave",
            {
              "ammo": {
                "type": "Missile",
                "count": 1
              }
            },
            {
              "ammo": {
                "type": "Super",
                "count": 1
              }
            }
          ]
        }
      ]
    }
  ]
}
"canHorizontalShinespark"
{
  "shinespark": {
    "frames": 123,
    "excessFrames": 5
  }
}
"canSpaceJumpWaterBounce"
{
  "or": [
    {
      "and": [
        "HiJump",
        "canSpaceJumpWaterEscape"
      ]
    },
    {
      "and": [
        "canTrickyJump",
        "canDownGrab"
      ]
    },
    "canWalljump"
  ]
}

Requires:

"canSpaceJumpWaterBounce"
{
  "or": [
    "canWalljump",
    {
      "and": [
        "canSpaceJumpWaterEscape",
        "HiJump"
      ]
    },
    {
      "and": [
        "canTrickyJump",
        "canDownGrab"
      ]
    }
  ]
}

Requires:

"SpaceJump"
{
  "or": [
    "canWalljump",
    {
      "and": [
        "canSpaceJumpWaterEscape",
        "HiJump"
      ]
    }
  ]
}

Letting Mama Turtle sleep, climb the right wall using HiJump (with a down-grab) and escape the water with Space Jump .

Requires:

"HiJump"
"canDownGrab"
{
  "or": [
    {
      "and": [
        "canSpaceJumpWaterBounce",
        "canWalljump"
      ]
    },
    "canSpaceJumpWaterEscape"
  ]
}

Escape the water using a well-timed Space Jump water bounce followed by a frame-perfect Space jump just above the water, at a specific time when the tide is descending.

Requires:

{
  "notable": "Space Jump Escape"
}
"canSpaceJumpWaterEscape"
"canInsaneJump"

Requires:

{
  "or": [
    {
      "and": [
        "canSpaceJumpWaterBounce",
        "canWalljump"
      ]
    },
    {
      "and": [
        "canSpaceJumpWaterEscape",
        "HiJump"
      ]
    }
  ]
}

Use SpaceJump to break out of the water. Afterward, it's easiest to use a wall jump to gain height but this is not required.

Requires:

"HiJump"
{
  "or": [
    "canSpaceJumpWaterEscape",
    {
      "and": [
        "canSpaceJumpWaterBounce",
        "canWalljump"
      ]
    }
  ]
}

Requires:

"HiJump"
{
  "or": [
    "canSpaceJumpWaterEscape",
    {
      "and": [
        "canSpaceJumpWaterBounce",
        "canWalljump"
      ]
    }
  ]
}

Requires:

"canSuitlessMaridia"
"HiJump"
{
  "spikeHits": 1
}
{
  "or": [
    "Gravity",
    "canWalljump",
    "canSpaceJumpWaterEscape",
    "canSpringBallJumpMidAir",
    {
      "and": [
        "canJumpIntoIBJ",
        "h_canUseSpringBall"
      ]
    },
    {
      "spikeHits": 1
    }
  ]
}

Requires:

"canSuitlessMaridia"
{
  "or": [
    {
      "spikeHits": 1
    },
    "canTrickySpringBallJump",
    {
      "and": [
        "HiJump",
        {
          "or": [
            "canWalljump",
            "canDownGrab",
            "canSpaceJumpWaterEscape",
            "canSpringBallJumpMidAir"
          ]
        }
      ]
    }
  ]
}
{
  "or": [
    {
      "spikeHits": 1
    },
    "HiJump"
  ]
}

Requires:

"HiJump"
"canSpaceJumpWaterEscape"

Requires:

"HiJump"
{
  "or": [
    {
      "and": [
        "canSpaceJumpWaterBounce",
        "canWalljump"
      ]
    },
    "canSpaceJumpWaterEscape"
  ]
}

Escape the water with either HiJump or SpaceJump, then carefully jump and morph into the tunnel.

Requires:

"canSuitlessMaridia"
"canMidAirMorph"
{
  "or": [
    {
      "and": [
        "HiJump",
        "canPreciseWalljump",
        "canWallJumpInstantMorph"
      ]
    },
    {
      "and": [
        "HiJump",
        "canSpaceJumpWaterEscape"
      ]
    },
    {
      "and": [
        "canPreciseWalljump",
        "canSpaceJumpWaterBounce"
      ]
    }
  ]
}

Watch for the water level to start falling to time the jump to escape at its lowest point. Then use SpaceJump to splash on top of the water. Time another jump with the water level or walljump to fully escape the water.

Requires:

{
  "or": [
    {
      "and": [
        "canSpaceJumpWaterBounce",
        "canWalljump"
      ]
    },
    "canSpaceJumpWaterEscape"
  ]
}
"HiJump"
{
  "or": [
    {
      "enemyDamage": {
        "enemy": "Menu",
        "type": "contact",
        "hits": 1
      }
    },
    "ScrewAttack",
    "canStaggeredWalljump",
    "canPseudoScrew",
    "h_pauseAbuseMinimalReserveRefill"
  ]
}