|Norfair||Crumble Shaft||100%||Crumble Shaft missiles (optimal)||Advanced|
Fire a shot as you crest the third small hill, and release dash at the same time. This will open the door with enough time that you can run through. Start holding another shot before you hit the door, and release shot during the door transition. Once the next room loads, the shot should fire automatically, and you can jump to the other side.
The window on this jump is very small before you hit the crumble blocks, so you'll need to be precise. If the second Dessgeega jumps low, you'll need to fire the shot while Samus is inside its hitbox, where you can fire it earlier if the Dessgeega jumps high.