In "Cinerama Adventure" (documentary 2002) they used cropped clips of N1203 from "Seven Wonders of the World" (1956) for the lead-in to the volcano sequence.
"The effervescent Paul Mantz took off one morning to get a Cinerama shot of a volcano. When they came back I thought the crew looked a little pale. Yes, they had photographed the volcano. Paul had flown round the rim twice and then said, 'Look out, boys, I'm going in,' and he had dived right into the center of it" ....Bill Lipscomb, Cinerama screenwriter, who was with them in the Congo, quote in "Seven wonders of the world", the BOOK by Lowell Thomas (1956).
"We dove into the crater...I'll tell ya', it was the hairiest thing I've ever been through in my life"...James Morrison, Cinerama assistant director, interview in "Cinerama Adventure"
...and Morrison in 'Air and Space Magazine', August 2011..."suddenly, over the edge of the left engine and through the spinning prop, I saw a crater yawn, spewing blue smoke; the airplane banked, plunging into the smoke. Roiling lava fire came ever closer and sulfur fumes filled the cabin. Mantz pulled the bomber into an aching turn. I could no longer force my head to look down. Against gravity’s pull I peered up and saw blue sky above the volcano’s rim. I coughed...An engine coughed in reply...up we went, just over the rim, into sunshine."
"Above & Beyond: Mantz Versus the Volcano, Filming for Cinerama with a fearless flyer"
For full article...google search: "Above & Beyond: Mantz Versus the Volcano"
Mantz on flying into the crater of an active volcano:
"I figured I'd do it by going in fast enough so I could climb out if they quit. I was over three hundred when I went into the crater.
Lost an engine for a few turns, No oxygen down there."
“I’ll Put on One Hell of a Show”, Theodore Taylor & James Atwater
The Saturday Evening Post, October 9, 1965