Rising oil prices and inflation worries pushed the index into a negative zone to touch a day's low of 14,846 - down 726 points from its previous close.
Reports of weakening trends in global stock markets on concerns rising crude oil prices, which had surged to all time high of $139.12 per barrel on Friday and an increase in US unemployment rate weakened the trading sentiments in India.
Realty, IT, banking and oil and gas stocks suffered the most. The index recovered partially and touch the day's high of 15,203. The Sensex finally closed at a loss of 506 points to 15,066.
The 10 largest falls of the Sensex1. Jan 21, 2008 - 1,408.35 points
2. Mar 17, 2008 - 951.03 points
3. Mar 3, 2008 - 900.84
4. Jan 22, 2008 - 875.41 points
5. Feb 11, 2008 -833.98 points
6. May 18, 2006 - 826.38 points
7. Mar 13, 2008 - 770.63 points
8. Dec 17, 2007 -769.48 points
9. Oct 17, 2007 - 717.43 points
10. Jan 18, 2007 - 687.82 points