Percy nodded. “One thing first, though. Hazel, there’s about a ton of Imperial gold weapons and armor at the bottom of the bay now, plus a really nice chariot. I’m betting that stuff could come in handy.…”
It took them a long time—too long—but they all knew those weapons could make the difference between victory and defeat if they got them back to camp in time.
Hazel used her abilities to levitate some items from the bottom of the sea. Percy swam down and brought up more. Even Frank helped by turning into a seal, which was kind of cool, though Percy claimed his breath smelled like fish.
It took all three of them to raise the chariot, but final y they’d managed to haul everything ashore to a black sand beach near the base of the glacier. They couldn’t fit everything in the chariot, but they used Frank’s rope to strap down most of the gold weapons and the best pieces of armor.

The Son of Neptune, Chapter XLVIII