Nine days after the scuba boat Conception went down in flames with 34 people trapped below deck in one of the deadliest disasters in California maritime history, a federal grand jury began looking into whether a crime had been committed. Now, a year after the Sept. 2 tragedy, investigations into the cause of the pre-dawn blaze and whether someone is to blame are still ongoing, though court documents say criminal charges are imminent. The captain of the boat, who could face an unusual federal manslaughter charge, was briefed in July on the evidence prosecutors have against him.