To access the middle door in the Gerudo Sanctum after releasing the quicksand, follow these detailed steps:

1. Release the Quicksand:
– To release the quicksand, you need to pull a plug to drain the sand from the area. This is typically done by pulling a plug using your Bind ability, which will expose a hidden path.

2. Navigate to the Intersecting Walls:
– After releasing the quicksand, you will find a room with three intersecting walls. The middle door is one of these walls, but it is initially blocked by sand.

3. Open the Middle Door:
– To open the middle door, you need to place two distinct animal statues on pressure plates. These statues are found as Echoes throughout the Sanctum, and their specific locations are indicated by clues on tablets hidden throughout the dungeon.

4. Find the Clues:
– The first clue is found by defeating enemies and blowing sand piles away with a Tornado to reveal a chest containing the first tablet clue. The clue reads: “It stands quietly in the sanctum. It is blue in color, with large tusks and a long nose”.

5. Locate the Statues:
– Use the clues from the tablets to locate the correct animal statues. For example, the elephant statue is mentioned in one of the clues, indicating it should be placed on one of the pressure plates.

6. Place the Statues:
– Once you have the correct statues, place them on the pressure plates. This will unlock the middle door, allowing you to proceed further into the Gerudo Sanctum.