
After rearranging the pistons in the engine room and crossing over them to obtain the Silver Dragon secret, as shown in the last section, follow the rusty passageway beyond the fourth piston...

...to a dead end with a movable block. (The block sequence is also illustrated in a diagram in the main walkthrough.)

Push the block three times (as far as it will go).

You'll reveal a hole in the floor on the left leading down into the room below. Do not drop down yet. Instead, go around to the left to a second movable block.
NOTE: If you fall through this hole (or the one in the room below) prematurely, there's a note on backtracking in the main walkthrough.

Push this block once.

Return to the first block, and pull it back twice.

Jump across the hole in the floor into the hallway near the second block and go to the right.

In the area behind the first block you'll find 2 boxes of shotgun shells (6-7).
NOTE: If you don't yet have the SHOTGUN, you'll get it here, along with one box of ammo.

Now, drop through the hole in the floor...

...and flip the piston switch again to the up position. This moves the pistons back to their original configuration. Do not drop down through the hole near the piston switch. Instead, climb back up into the hallway where you moved the blocks.
NOTE: Again, check the note in the main walkthrough if you accidentally fall through the hole.

Turn around, jump across the hole in the floor...

...and follow the corridor...

...back to the doorway overlooking the ENGINE ROOM.
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