The vanquished were enchained and thrown into Tartaros, which is as deep below the earth as the earth is below the sky. An anvil dropped from the sky falls for nine nights, and on the tenth it reaches the earth; and likewise it falls nine nights and days from the earth, and on the tenth day it reaches Tartaros. Tartaros is surrounded by an iron wall.
Kerényi presents Tartaros as the cosmological extreme of depth and total enclosure, the final prison of the defeated Titans, establishing it as mythographic ground-zero for the imagery of absolute psychic imprisonment.
, The Gods of the Greeks, 1951thesis