When a cell is kept in a hypertonic solution the water from the cell starts to move out of the cell and the cell membrane starts to shrink away from the cell wall, this is called plasmolysis. When full water is removed it is called a plasmolyzed cell.
As the cell wall is fully permeable so some amount of hypertonic solution enters the space between the cell wall and cell membrane.
Final answer:
The space is occupied by the hypertonic solution in which it was kept.