This chamber, a full 30 feet below the Upper Dungeon, isn't made of stone blocks, it's hewn from the living rock of the earth.  10 by 15 feet, its domed ceiling and walls show the tool marks its excavation.  There are numerous lines of filth on the walls marking the various levels that water has risen up the walls during previous rainy seasons.
The Lower Dungeon Guard Room, Dungeon
murderer
king
I am the most powerful man in the country. I like that people fear me. I will destroy all that oppose me.
Ha!  Foul assassin, I hope you like the view here, for it's all your lot is likely to see for some time, you murderer. Oh my dear, King. In the dungeon Guard room with me and rising waters, is this how you imagined your final hours? 