Ulysses's boat passes the sirens, they start singing and try to get the sailors to dive into the water. When Ulysses saw the hideous singers, he couldn't imagine such wonderful voices coming from such ugly creatures.
Oh, they're hideous!
While carefully sailing through the narrow waters, Ulysses orders the crew to sail directly in the middle. But, when an oar slightly touches to side of Scylla, and she pulls the boat towards her.
Everyone, be careful!!
Scylla pulls the boat towards herself, and grabs six sailors. Ulysses listens in vain to his men screaming, for they are being eaten alive.