The Sensex at the Bombay Stock Exchange surged 172 points, or 1 per cent, to 17,760 in opening trade, today, on sustained buying by funds and retail investors, as higher industrial production in January, and positive regional markets buoyed trading sentiment. Afterwards, the Sensex rose further, and stood 215 points, or 1.2 percent in the positive zone, at 17,803 in afternon deals, a short while ago. The 30-share Sensex has already climbed more than 440 points in the past two trading sessions. Key stock indices in Japan, Hong Kong, Indonesia, Singapore, South Korea and Taiwan were up by between 0.3 percent and 1.3 percent, today, on optimism that the euro- zone finance chiefs will complete the second Greek bailout. Over on Wall Street, the US Dow Jones Industrial Average had added 0.3 per cent, overnight.