This is for entering from Mt. Everest. Samus must be carefully positioned in order to make it up to the top of the room. One method is to press against the pipes jutting out on either side of the room, turn around while morphed, then arm pump in between grapple jumps in order to move one tile toward the center of the room.

Entrance condition:

{
  "comeInWithGrappleSwing": {
    "blocks": [
      {
        "position": [
          -1,
          5
        ],
        "environment": "water",
        "note": "Mt. Everest"
      }
    ]
  }
}

Requires:

"HiJump"
"canPreciseGrappleJump"