What was the anguish or trouble that Tiresias foretells regarding Poseidon?

Tiresias foretells that Poseidon will unleash his wrath upon Odysseus and his crew for blinding his son, the Cyclops Polyphemus. He warns that this anger will lead to tumultuous seas and hardships during their journey home. Tiresias emphasizes the need for Odysseus to appease Poseidon to alleviate the suffering and difficulties they will face as a consequence of their actions. This prophecy underscores the theme of divine retribution and the importance of respecting the gods in Greek mythology.