Three young people are dead, a 6-year-old boy is missing, and a 16-year-old girl is being called the sole survivor after a car plunged into a Delaware canal on Sunday morning, Oct. 6, police said.

It happened about 9:40 a.m. when a Chevy HHR, went into the water on the south side of the Chesapeake & Delaware Canal and was completely submerged, Master Cpl. Michael Austin of the Delaware State Police said,  USA TODAY reported.

The 16-year-old girl said that the 18-year-old driver of the car helped her get safely to shore, then went back into the water to try to rescue the three boys, Austin said.

Just before 5 p.m., the car was removed from the water. Police said the victim was identified as an 18-year-old male driver, a 16-year-old boy, a 12-year-old boy, and a 6-year-old boy who remains missing.

The driver’s body was found in the water nearby. Austin said, “He was a hero and tried to do everything he could to help the remaining passengers in that vehicle.”

The bodies of two boys ages 16 and 12, were located inside the vehicle when it was pulled from the water, police said, 6ABC reported.

All of the boys were related, and the teenage girl was a friend, the Delaware News Journal reported.

The search and related investigation are active and ongoing, a Sunday evening press release from state police said.

Anyone with any information is asked to call police at 302-365-8486.