Otto Silbermann was an investigator who, in 1930, published a short work on the existence of Atlantis.>Sprague de Camp commenting on Silbermann’s Atlantis theories described them as “the most plausible African interpretation of Atlantis.”<
He covers all the principal theories of his day and finishes off with his conclusion that the Atlantis story had been based on a Phoenician record of a war between Egypt and Libya that had been fought in the Chott region around 2540 BC. He argued that a story such as the Atlantis tale could not have survived oral transmission with all the details recorded by Plato for 9,000 years. I must say that I consider this an extremely valid opinion. Nevertheless, a 2015 report from Reid & Nunn highlighted the ability of Australian aborigines to transmit faithfully, a record of events over even greater timespans.(a)
Although Silbermann appears to have been German, he published his book in French and apparently planned a second publication with the title of A Discovered Continent: The History of a Libyan-Phoenician Atlantis, of which I can find no trace.