Odysseus used wax to protect his crew from the deadly song of the Sirens.
Odysseus plugged the mens' ears with wax when the ship approached Scylla and Charybdis to protect them from the deadly song of the Sirens. This was crucial as the Sirens' enchanting voices lured sailors to their doom, causing them to steer their ships towards the rocks. By blocking his crew's ears, Odysseus ensured they could resist the alluring song and safely navigate past the dangerous Sirens.
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