Plato frequently gave detailed descriptions of utterly fanciful situations. He wasn't a historian and wasn't particularly interested in details of the physical world. He wrote dialogues about philosophy and was interested in the world of forms, and any story he told that was seemingly grounded reality was in service of making a larger point. In fact, even the dialogues themselves purported to be actual conversations between real people and almost certainly were not in most cases, no matter how much detail he provided about the event.