Garen was imprisoned in a sea prison and fell into despair. Who saved him?

Athena.

When he was in the Twin Wombs, Gallon once said: "I saved my life because I was saved by Athena." This paragraph appeared in Gallon's memories, and in his memories, memories of his childhood appeared. Athena, "It was Athena's small universe that allowed you to pick up your name again and again." It was Ikki who told Garen the truth about his childhood when he was in the Gemini.

Extended information:

Garen's character introduction:

Garen is a character in the anime "Saint Seiya" and belongs to the Gemini Gold Saint Saga. The younger brother has a similar appearance to Saga and is as strong as Saga. The physical (physical) strength is equal to Radamandis, and the mental strength is stronger than Radamandis. He is the most powerful sea warrior who initiated the war between Poseidon, the Poseidon, and the goddess Athena.

After the Poseidon Chapter, he inherited his brother Saga's legacy and became the Gemini Gold Saint. In the Holy War of Hades, he died together with Rhadamandis, one of the three giants of the underworld.

Baidu Encyclopedia - Gallon