The Rishi Atri of great austerity could not fathom its bottom, lower than the nether regions, though he tried to do it for one hundred years.
ब्रह्मर्षिणा व्रतवता वर्षाणां शतमत्रिणा। अनासादितगाधं च पातालतलमव्ययम्॥