Why is scylla so dangerous?

Scylla is considered dangerous in mythology due to her monstrous form, featuring multiple heads and a ravenous appetite for sailors. Residing on one side of a narrow strait, she poses a lethal threat to ships navigating the waters, devouring anyone who ventures too close. Her presence creates a dilemma for sailors, forcing them to choose between facing her and the equally perilous whirlpool, Charybdis, on the opposite side. This dual threat symbolizes the challenges of navigating perilous situations where every choice carries significant risk.