Two large water tanks occupied the eastern side of the tower. Above both was a single shaft
with worm gears on each driving stirrers in each of the tanks. This drive appeared to be driven
by a motor at the far end of the room, linked by a belt. There was also a small sink at the end of the room.
The western side of the tower was inaccessible and I assume the water tanks we spotted the level below continued through this one.