Indeed, Okrand's goal in inventing Atlantean was to recreate Indo-European, and it thus borrows from several languages yet contains no recognizable words from these linguistic systems.
The People of the Sea, as the Atlanteans were sometimes called, first carried firecrackers and then gun powder to the Far East.
Many think the unusual linguistics and genetics associated with the Basques—being markedly different from the Indo-European people and most likely having a different origin—make a strong case for associating them with Atlantis, and the Basque people have had historic links to sorcery and witchcraft. Merlin, also spelled Merlyn and Myrrdin, and the Lady of the Lake were priest and priestess of the Atlantean religion, coming from the western lands.
How Atlantean sounded or how the various alphabets worked is anyone's guess, of course, but since there is a certain logic to how language is constructed, we might allow that theirs may not have been so different from our own. On the other hand, some of their tongues may have been truly exotic and indecipherable .