Wrecked Ship Main Shaft
|Wrecked Ship Entrance
Wrecked Ship West Super Room
|Adjacent rooms||Wrecked Ship Save Room
Wrecked Ship East Super Room
To pass through the floor on the way to the attic, break only the top block of a vertical pair. Jump into this space and press L. You'll notice your feet are in the block. Jump to pass through the floor above you.
This is most useful in categories that do not have the Wave Beam by this point in the run, like Any% PRKD or Low% Ice. For Any% KPDR or 100%, this may not actually save time at all compared with shooting out the row of blocks and running through.