Lost Continent(1986)

Naruse Osamu is a top reporter for the Tokyo Times. He’s hardly had a day off in years, so when his free time is interrupted while on a visit home, he is not surprised. Osamu is sent to investigate an abandoned seaplane called the Shirase. The Shirase was the plane used in an expedition to find a lost land that scientists believed to exist. Naruse’s investigation takes him across the world, and into the Lost Continent. He will return with proof, for no one will believe him otherwise.