text: One child is dead after a car plunged off a road into Los Angeles harbor on Thursday. Two children were pulled from the submerged vehicle then hospitalized in grave condition where one later died. The car left a parking lot at the Ports O' Call entertainment area of San Pedro shortly after 6pm and ran off the road at Berth 73 of the Port of Los Angeles. The car traveled some distance before lurching into the harbor, where it landed upside down in about 30 feet of water just off of Berth 73, Fire Department spokesman Brian Humphrey said. Scroll down for video . Pulled from the water: A car plunged off a road into Los Angeles harbor on Thursday, and two children pulled from the submerged vehicle were hospitalized in grave condition until one later died . Rescue attempt: The two children pulled from the submerged vehicle by firefighters were hospitalized in grave condition, authorities said . Hero: Firefighter Miguel Meza (left) who dove into the water in San Pedro after a car carrying a family of four plunged into the water has been hailed a hero on the Facebook page of City Councilman Joe Buscaino (right) Two adults were found swimming in the water when rescuers arrived, he said. Divers found two children inside the car. They had no pulses and weren't breathing when divers brought them up, and resuscitation efforts began immediately, Humphrey said. The adults were described as being in fair condition but 'clearly emotionally distraught,' Humphrey said. Firefighter Miguel Meza who dove into the water in San Pedro after a car carrying a family of four plunged into the water has been hailed a hero on the Facebook page of Los Angeles City Councilman Joe Buscaino. 'Firefighter Miguel Meza jumped into the water at Berth 73 tonight in San Pedro after a car with a family of four drove into the water. This man is a true hero in the City of Angels and I am so proud of him!, he said. Sucessful search: Divers emerge from the water as debris believed to be from the car floats to the surface where a car went off the berth and into the water . Divers working in murky water searched the car and even opened the trunk, but they found no one else in it, Humphrey said. The cause of the accident was under investigation. 'We don't know at this time whether it was an accident or an intentional event,' he said. Nearly 100 firefighters, divers and helicopter and boat crews went to the scene, Humphrey said. ABC reports that the event that led up the incident remain unknown. Witnesses told police that they heard screeching tires before the car made the plunge. One dead: One of the children who fell into the LA Harbor has died and another child is in grave condition .
target: A car plunged off a road into Los Angeles harbor on Thursday, and two children pulled from the submerged vehicle were hospitalized .
  The adults were described as being in fair condition but 'clearly emotionally distraught'
  The events that led up to the accident are unknown .
  The victims have not been identified but they have been confirmed as a family .
  Firefighter Miguel Meza who dove into the water in San Pedro after a car carrying a family of four plunged into the water has been hailed a hero .