After they have all remained on the island for a year, Circe advises Odysseus that he must first visit the Underworld, something a mortal has never yet done, in order to gain knowledge about how to appease the gods, return home safely and recover his kingdom. Circe also advises him on how this might be achieved and furnishes him with the protections he will need and the means to communicate with the dead. On his return, she further advises him about two possible routes home, warning him, however, that both carry great danger.