Hermes, the messenger god, tells Calypso that Zeus has ordered her to offer Odysseus his freedom. If she does not do this then her whole island will sink to the bottom of Poseidon's oean.
He is going to free Odysseus from Calypso's island.
Zeus sent Hermes to tell Calypso to set Odysseus free. Calypso offered Odyseus immortality to make him stay, but he refused to stay on Ogygia.
After keeping Odysseus as a prisoner of love for seven years Calypso has to obey Zeus's commmand to set O. free. She also shows him where to get material for him to build a boat.
Calypso offers immortality to Odysseus
Hermes tells Calypso to let Odysseus go.
Odysseus met Calypso on her lush island of Ogygia.
Odysseus is still trapped on the island of Ogygia with Calypso, the immortal nymph.
Calypso
Circe and Calypso kept Odysseus from reaching home in very different ways. After Odysseus conquers the goddess-enchantress Circe she helps him . She is an excellent hostess and lover to Odysseus and his men have to convince him to leave. Calypso falls in love withe Odysseus and keeps him captive until Hermes convinces her to let him free.
Calypso has the power of immorality over Odysseus.
At the beginning of the book, Odysseus has already met Calypso. In book 5, the plot jumps to Calypso and Odysseus on Ogygia, Calypso's island. In book 11, Odysseus recounts how he ended up on Calypso's island.
Hermes is sent down to Calypso, telling her that the gods wish for her to release Odysseus. Therefore, it is Calypso who allows Odysseus to leave, not Odysseus who 'manages to say no.'