1933
 expedition of Ralph ("Roy") Waldo MINER to the Bahamas
and color films by Roswell MILLER
1933
 "L'Hippocampe" ("the seahorse") , a film by Jean PAINLEVE
1933
 a failed attempt of making a photo in 5400m sea depth by Fenimore JOHNSONS
1934
 Pater A. POIDEBARDS makes an archaeological expedition to Tyr in the Lebanon
1935
 "Club des sous-l'eau" ("Club of the underwater-friends") by Jean PAINLEVE and commander Yves LE PRIEUR with several underwater-photo- and movie-cameras for amateurs
1935
 photo in a depth of 500 fathoms (900 m) with the Bathysphäre of Otis BARTON
1935
 works of John CRAIGH in Mexico
1935
 LEONTOVITCH operates in 20 m depth; the film is projected in Moscow
1936
 publication of the book by A. POIDEBARD ["Tyr, un grand port disparu"]
1936
 the italian Victor DE SANCTIS makes an underwater-documentation in 35 mm about swimming and waterpolo in the swimming pool of Turin with a halfsubmerged camera
1938
 first photos of the austrian Hans HASS in the Adria
1939
 first films of Hans HASS in the Netherlands Antilleses
1939
 16mm film of Philippe TAILLIEZ
1939
 photos of the deep sea in 1260 m by E.Newton HARVEY and Edward R. BAYLOR (USA)
1941
 photo in -4860 m by the american Maurice EWING