The bottle dungeon, in the North West (Sea) Tower of the castle, was a rather ominous pit of imprisonment. Hewn from solid rock in the late 14th century, it takes its name from the narrow, and only entrance/exit in the floor of this room, dropping 24 feet to the floor of the dungeon below. The circular wall in this room, looking like the well in the courtyard, is a later addition for the safety of visitors, and forms a "neck" on the bottle. It is entirely possible that the martyr Patrick Hamilton was confined here in 1528, and George Wishart in 1546.