Answer:
Helios threatened to not shine anymore.
Explanation:
Odysseus had lost the direction of Ithaca, but still he departed. Circe advised him to pass earlier in Hades and consult the shadow of the soothsayer Tiresias. When he got there, he encountered several other shadows of dead heroes and heroines, who warned him about a troubled return, emphasizing that they should not eat any cows from the herd of Helios (god of the sun).
On the way, they faced the harassment of the mermaids, escaping because they were able to cover their ears; passed by the gigantic whirlwind "Caríbdis"; by a multi-headed monster named "Cila" when they finally reached Trinna, where the god Helios guarded his herd.
When Odysseus fell asleep, his men who were hungry disobeyed and killed some cows to eat. Helios was furious and complained to Zeus, threatening that the sun would no longer shine if Zeus did not punish those men. For this reason, Zeus destroyed the whole vessel on the high seas and the men of the crew, sparing only Odysseus, for he was the only one who had not touched the animals.
