The $15 billion hole-in-the-ground – From the Boston Globe: “Big Dig officials chose not to retest” – “Several ceiling bolts came loose in the Interstate 90 connector tunnel while it was under construction in 1999, even after they passed a safety inspection. But project documents show that officials overseeing the Big Dig chose not to retest most of the bolts in the tunnel, including those that would suddenly fail seven years later, causing last month's fatal ceiling collapse.”