Wait the water tide to reach its peak, then crouch jump into a spring ball jump into an IBJ. Perform the spring ball jump near max height. Place the first bomb between about 4 and 6 frames after the spring ball jump; ideally it should be just above the water line. Press pause between about 5 and 10 frames after placing the bomb, to disable Spring Ball (a 'spring fling', to reset fall speed). Place the second bomb soon after regaining control, while the game is fading back in. When close to the top, perform a spring ball jump to reach the ledge; release jump as soon as Samus is high enough to clear the ledge, in order to avoid taking a Menu hit.