Perform 176 moonfalls using the respawning shot block: after each moonfall, destroy the shot block (aiming up with angle up + angle down) and press forward to stand up; wait for the shot block to respawn before performing the next moonfall. On the 176th moonfall, Samus will sink a tile into the floor. Use Grapple to stand back up and perform 146 more moonfalls using the respawning shot block. On the 146th moonfall, Samus will sink 2 tiles into the floor. From here, continue using Grapple to stand up and perform another 145 moonfalls, but now without needing to use the shot block. After clipping 2 tiles into the floor with the 145th moonfall, unequip Grapple and perform a final 146th moonfall from 2 tiles deep in the floor to clip past 3 more tiles and reach the bottom of the room. Note that exact counting needed here: losing count and performing the 146th moonfall from the surface would cause Samus to clip 3 tiles into the floor and be stuck in a crouched state, unable to stand back up with Grapple nor able to perform the final moonfall needed to clip the rest of the way down; conversely, performing a moonfall early from 2 tiles deep, before gaining enough speed, will result in Samus only clipping down through a total of 4 tiles, again resulting in a softlock. This strat takes approximately 45 minutes to execute.