This image was originally featured in the Hetzel edition of 20000 Lieues Sous les Mers, and has also been featured in more recent editions (this particular instance was scanned in a recent edition). The images were originally drawn by Alphonse de Neuville and Edouard Riou. They are now the public domain, since their Droit d'auteur is expired.
Footnote: This is a French work. French law applies. France does not use the notion of "copyright", but a "Droit d'auteur" system.
Licensing
This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain for the following reason:
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.
You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain". This photographic reproduction is therefore also considered to be in the public domain in the United States. In other jurisdictions, re-use of this content may be restricted; see Reuse of PD-Art photographs for details.
Captions
In the viewbay, Nemo and Aronnax encounter a Cretan diver