Nov. 13 (UPI) -- On a rusted wharf in the northern port city of Haiphong, where U.S. B-52s once rained bombs for 12 straight days, 70-year-old fisherman Bui Quang Mong mends a worn fishing net. Half a century at sea has left his hands rough and steady, each scar a story of storms weathered, encounters with other boats and the relentless struggle to make a living from the sea. For fishermen, the South China Sea has always been a treacherous frontier -- typhoons, Chinese naval chases, detentions,