Beth Lamberson refused to believe her 5-year-old daughter could not be freed from a submerged airplane in Lovell even after one rescuer failed to save the girl. So the North Yarmouth woman took the goggles from the rescuer and dived back into Kezar Lake, where she was able to free her daughter from a seat behind the dead pilot and pull her to safety.

Though offering no cause, a National Transportation and Safety Board report released on Wednesday revealed new, dramatic details about the Aug. 4 plane crash.

The plane wreck killed pilot Joseph Solari; while Lamberson and her husband and two children survived.

According to the federal report, Beth Lamberson escaped the overturned float plane with her 3-year-old son, Kyle, by rushing out a back exit. Her husband, 37-year-old Kevin Lamberson, got out by kicking out the windshield. After surfacing, the couple realized that their daughter had not emerged from the plane.

As the Cessna sank into the lake, Solari lay dead behind the controls while 5-year-old Lauren Lamberson was trapped in her seat behind the cockpit, according to the report.

Almost immediately, others began to arrive in boats to help the injured and search for the missing.

“One of the rescuers had some goggles and went to get the pilot and daughter,” according to the NTSB report. “The rescuer found the girl still strapped in her seat behind the pilot but could not release the seatbelt. He returned to the surface, and the mother took the goggles, saying that she knew how to release the seatbelt, and proceeded to go down and get her daughter.”

Both the Maine Warden Service and the NTSB credited Beth Lamberson with saving her daughter, who spent a day at Maine Medical Center in Portland. The others were treated for lesser injuries and released.

The Lambersons did not immediately return calls Wednesday for comment about the crash and the federal report.

The family had been at a family reunion on Aug. 4 when they met Solari, who offered to take them on a sightseeing flight around the area that day, according to the report. The family told investigators that Solari, manager of Eastern Slopes Regional Airport in Fryeburg, had given them a thorough briefing on evacuation procedures before they took off.

When Beth Lamberson dove back into the lake to retrieve her daughter, she knew how to release the seatbelt because she had been instructed by Solari, according to the report.

The takeoff as uneventful, the family told the NTSB. The first sign of trouble arose as Solari began to set the plane down on a narrow section of Kezar Lake just north of Middle Bay.

“As the airplane touched down on the water, they felt like it skipped and immediately went over on the nose in a (somersault),” according to the report. “The cabin filled with water immediately, and it got dark and quiet.”

According to the Warden Service, the Cessna had retractable landing wheels in its pontoon. When Solari was landing, the wheels caught the water, which caused the plane to flip.

The NTSB report released Wednesday is considered preliminary information. More conclusive findings are expected to be released later.

Solari, 69, was a former Fryeburg selectman who was described by friends and colleagues as a “flawless pilot” who had been flying for at least two decades.