What year was this photograph taken? Study it, then reveal the answer below — or play it as a round and see how much HP you keep.
A mechanic named David as diver at Observatoire océanologique de Banyuls-sur-Mer. The upside down sign the man is holding says "Photographie sous-marine" (underwater photography). This photo is detailed by Louis Boutan in his work : Boutan, Louis (1900) " IX " in (in French) La photographie sous-marine et les progrès de la photographie , Paris : Schleicher Frères, pp. 204−206 Retrieved on 15 June
