Eight marines and one sailor were killed July 30 when an amphibious tank sank The training accident 70 miles off San Diego´s coast was one of the deadliest for the Marines in recent years. Leaders said it could have been prevented A new report found the accident was caused by shabby maintenance of the amphibious assault vehicles and poor judgement by commanders Barely a week after its release, a new probe has been launched into the disaster It follows outcry from the relatives of those who died in the accident