How does Homer make his description of the actual
voyage through Scylla and Charybdis terrifying?
The scene with Charybdis and Scylla is one of the best depicted scenes in the whole Odyssey, aiming not to build tension into the readers but to scary or even terrify them.
Actually, the whole story does not begin when Odysseus faces the danger but a bit earlier. When Circe tells him what to kind of monster he will meet, this anticipates us to get ready for real horror and builds up the tension as they are sailing. But when the Trojan heroes reach the place the horror is even bigger than what we are ready for. Only the first sentence contains more than enough to see the high seriousness of the situation. Odysseus’ men are “wailing in terror” i.e. all the braveness and manhood are gone and they look more like women or babies.