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(CNN) —  

Two bodies have been recovered after a Boeing 767 cargo plane nose-dived into shallow water in Texas with three people aboard, authorities said.

Hawthorne said the crash site in Trinity Bay near Anahuac, Texas, is in water just 5 feet deep and is reachable by airboats and other flat-bottom craft. The scene extends over 3 miles, he said.

Conrad Aska (left) and Sean Archuleta
Chambers County Sheriff's Office
Conrad Aska (left) and Sean Archuleta

Chambers County Sheriff Brian Hawthorne said in a news release the two bodies have been identified as First Officer Conrad Aska, 44, who was the copilot, and Sean Archuleta 36, the jump-seat rider. Aska’s body was recovered February 23 and Archuleta’s body was recovered February 24. Officials are still searching for the pilot of the plane.

Cardboard boxes and contents of packages were scattered across the water, along with parts of the twin-engine plane, Hawthorne said.

The plane was operated by Atlas Air Inc. on behalf of Amazon, the operator said in a statement.

“There was nothing intact of the airplane,” Hawthorne said. “Knowing what I saw, I don’t think anyone could survive it.”

Hawthorne said the crash site in Trinity Bay near Anahuac is in water that is 5 feet deep and is reachable by airboats and other flat-bottom craft. The scene extends over three miles, he said.

Multiple dive teams from the Texas Department of Public Safety, Houston Police, and the Baytown Police are at the crash site, he added.

Teams were still working to recover the suspected third victim, Hawthorne said late Sunday afternoon.

Several bystanders saw the plane go down

About six people saw the plane go into the water. Some said it sounded like the engines were surging, the sheriff said.

“There’s no doubt he was having some kind of problem with the airplane, according to the eyewitnesses,” the sheriff said. “Then it turned and went into a nosedive.”

Before rescue teams arrived, volunteers in airboats scrambled to the scene, CNN affiliate KTRK reported.

“That’s why we went out there, to save anybody,” volunteer Cade Till told KTRK. But after seeing the debris, Till realized the likelihood was slim.

The 767 was in a normal descent as it approached the airport, then went into a “very, very rapid descent” at 6,300 feet, National Transportation Safety Board Chairman Robert Sumwalt told reporters.

Atlas Air said three people on the plane “and their family members are our top priority at this time.” The operator said it was cooperating with federal investigators.

The president of the Airline Professionals Association, Teamsters Local 1224, said the three people on the flight were union members.

“Our union stands together as a family and in support of our members’ families,” Daniel C. Wells, who is also an Atlas Air captain, said. “Our focus is on our friends and colleagues who were on that plane, and we are doing everything we can to support their families.”

The plane was built in 1992

Aerial images from CNN affiliate KPRC showed emergency responders on airboats near the site of a significant amount of debris.

“The joint operation between the Chambers County Sheriff’s Office, the National Transportation Safety Board and the FBI will continue to attempt recovery of victims and the aircraft,” the sheriff’s office said in a statement.

The plane was located in Jack’s Pocket at the north end of Trinity Bay, the Chambers County Sheriff’s Office said on Facebook.

According to the FAA website, the plane was built in 1992 and the flight number was 3591.

Boeing said it was saddened to hear about the crash.

“We are concerned about the safety of the three people reported to be on board the airplane,” it said. “We are prepared to provide technical assistance to the National Transportation Safety Board as it investigates the accident.”

CNN’s Steve Almasy, Rebekah Riess and Thom Patterson contributed to this report.