article_snippet.sent: The boy's parents swam to the surface, but the children were stuck in vehicle.
article_snippet.sent: the children weren't breathing when rescuers brought the children up.
article_snippet.sent: Rescue attempt: two children pulled from vehicle by firefighters were hospitalized in grave condition, authorities said .
highlights_snippet.sent: The parents swam to the surface
highlights_snippet.sent: but the two boys were trapped .
  