Perform a Crystal Flash in order to refill reserves. Position Samus below the 2-tile space of the ceiling Morph tunnel. Jump as Samus reaches 4 Energy, and mid-air morph, timed so that reserves trigger while Samus still has upward momentum just before Samus would hit the ceiling. If done properly, the R-mode standup will cause Samus to clip into the ceiling Morph tunnel. If successful, Samus will end up crouched in the tunnel; press down to morph, then roll out to the right to exit the room.

With a mid-air morph, this has a 4-frame window for the jump. It is also an option to pause abuse: instead of jumping at a precise Energy value, set reserves to manual, wait until Samus is close to zero Energy, then press pause and wait a moment before jumping (firing a shot when pausing may help create a visual cue), so that Samus is at 0 Energy and in position just below the ceiling when the pause hits. Then set reserves to auto (and re-equip Varia if available) and unpause.

Entrance condition:

{
  "comeInWithRMode": {}
}

Requires:

"h_heatedCrystalFlash"
"canRModeStandupClip"
"canInsaneJump"
{
  "heatFrames": 140
}
{
  "disableEquipment": "Varia"
}
{
  "autoReserveTrigger": {}
}
{
  "heatFrames": 275
}

Dev note: Jumping using Spring Ball is also possible, which simplifies the movement by avoiding the need for a mid-air morph; it still has a 4-frame window for the jump timing. Jumping and aiming down is also possible but only gives a 2-frame window for the jump.