It takes around 4 minutes to get the Zero to this door. Crouch jump to touch a well timed Cacatac spike at the peak of Samus' jump. Use a neutral damage boost to gain some height. At the peak of the boost, down grab the ledge. The Zero only moves on camera and the camera scrolls when exiting the morph tunnel. Let the Zero lead through the morph tunnel or wait for the it to get very close to Samus before touching the scroll block at the exit.

Requires:

"canBeVeryPatient"
"Morph"
"canNeutralDamageBoost"
"canTrickyDodgeEnemies"
"h_crouchJumpDownGrab"
{
  "enemyDamage": {
    "enemy": "Cacatac",
    "type": "spike",
    "hits": 1
  }
}

Exit condition:

{
  "leaveWithGModeSetup": {}
}