Stand on the edge of the sand and place a Power Bomb; unmorph (leaving Samus crouched), then wait a moment before pressing forward to enter the sand. On the exact frame when the Power Bomb begins to propel Samus upward, press down, and press jump on the same frame or one frame later. Move right to press against the wall before mid-air morphing (alternatively, a stationary lateral morph can work). There is a 13-frame window for when to enter the sand: if Samus enters the sand too early, she will sink slightly too far, resulting in not quite enough height to reach the tunnel; if Samus enters the sand too late, she will not get properly boosted by the Power Bomb explosion and will end up stuck in the sand. The timing for the aim-down press is frame-perfect: it must be pressed on the first frame that Samus begins being propelled upward by the Power Bomb. if Samus aims down too early, she will get stuck in the sand; if Samus aims down too late, she will not get enough height to reach the tunnel. if Samus jumps too early or late, she will get stuck in the sand. The amount of time that Samus holds forward when entering the sand should be between 2 and 11 frames.