Keshub Mahindra, former chairman of the Union Carbide of India Ltd (UCIL) says he did not know if the lethal MiC (methyl-iso-cyanate) gas leaked from the Bhopal plant of his company in the intervening night of December 2-3, 1984. He, along with seven other officials of the company, accused in the case filed by the CBI, produced themselves in the court of chief judicial magistrate A K Gupta (CJM) for examination on Monday and Tuesday. This is for the first time in the 18-year history of the legal battle that these top officials of the UCIL presented themselves before the court in Bhopal.