Get a boost from a Bomb or Power Bomb while grappled to the second Grapple block below the top right door. Samus will enter a 'glitched grapple hanging' state where Samus' graphics will appear corrupted while swinging with Grapple. Press jump to get a good bounce off the wall at the bottom of the swing, making it possible to swing up to close the door. Heavy lag can typically be avoided by holding right during the bottom half of the swing. Retract Grapple while approaching the door. Samus should come to a stop about a tile in front of the door (at horizontal position 1753). Press right and then left, and Samus will fall through the floor. Back to the right within the air pocket, then jump and use Grapple diagonally up against the second Grapple block from the bottom, near its top. Samus should be pushed most of the way inside the wall; if not, morph and roll out to try again. Once in position far enough inside the wall, grapple diagonally up again to be pushed into the transition.