Blohm & Voss BV138. Unfortunately for the credibility of the Mission, the aircraft did not enter service until 1939, after the first two prototypes firs t flown in 1937 revealed shortcomings that needed a major redesign to correct, delaying service entry.
For your Information.... Dr. Lamont, chief of the expedition,
received from Blohm & Voss on December/1937 a "the prototype model of the BV138 V1 (D-ARAK)" which he painted orange to fly to his expedition in the Artic, very near Alaska, looking for millon year old "Ice Lizards". After the expedition he returned it to B&V with a complete list of modifications to both engines and pontoons as well as the radio equipment made at the time by Phillips in Holland. These mods led to the changes made on the planes that were on the assembly line.
The prototype was ...Ha 138 V1 (D-ARAK) - First flight on 15 July 1937.
So Amigo, the credibility

mix-smi

of the "fiction Mission" stands erect and firm.........
Note: Due to lack of photographs of the Atlantis Mission, the "Movie Poster" of it, used a photo of the mentioned B&V over Alaska!!!!!......
Note 2: Please note that the "Secret was found by Dr. Lamont in 1937" but the expedition did not
get going until November 1938 due to lack of funds........ at which time the government of France financed it .
Note 3.... No one should ever " jump the gun!!!"....................