The work Critias by Plato was left unfinished due to the death of the author and remains incomplete in its original form. It was intended to be a dialogue discussing the ideal society of Atlantis, providing insight into Plato's political philosophy.
Critias
Timaeus and Critias.
Timeus is about the structure of the world and similar stuff. Critias is about a war between Atlantis and Athens. You can read more here: http://en.wikipedia.org/wiki/Critias_(dialogue) and here: http://en.wikipedia.org/wiki/Timaeus_(dialogue)
They are Timaeus, Critias, and Hermos.
He told it in two of the Dialogues, "Timaeus," and "Critias," both of which were written in 360 BCE.
Diagoras, Gorgias, Protagoras, Antiphon, Prodicus, Critias of Athens, Hippias of Elis etc
Plato wrote about Atlantis in his works Timaeus and Critias, where he described it as an island powerful and advanced civilization that sank into the ocean. Plato likely drew inspiration from myths and stories circulating in ancient Greece, as well as his own philosophical contemplations about political systems and ideal societies. Atlantis is thought to be a literary invention rather than a factual place.
Plato only wrote about Atlantis in two of his dialogues, "Timaeus" and "Critias." In these works, Plato describes Atlantis as a powerful island civilization that eventually sank into the sea.
It never will be finished.
The first known mention of Atlantis was in Plato's dialogues Timaeus and Critias, which were written around 360 BC. This means that the first report of Atlantis was over 2,000 years ago.
finished - fini, complète
owarimashita = finished