A sightseeing boat that sank off Hokkaido a month ago, leaving 14 people dead and 12 missing, dropped back to the seabed at a depth of 182 meters as a salvage company was attempting to tow it, the Japan Coast Guard said Tuesday, in a setback to efforts to bring it to port for an investigation into the cause of the accident.The company will operate an underwater drone to attach nylon belts to the boat on Wednesday and plans to raise it the next day.Nippon Salvage Co. was scheduled to tow the 19-ton Kazu I to shallow waters to load it onto a barge and drain it of seawater for several days bef…READ FULL ARTICLE