After a few more hours of navigating, Percy’s eyes started to droop. He was afraid he’d pass out from exhaustion. Then he caught a break. A killer whale surfaced next to the boat, and Percy struck up a mental conversation with him.
It wasn’t exactly like talking, but it went something like this: Could you give us a ride north, Percy asked, like as close to Portland as possible?
Eat seals, the whale responded. Are you seals?
No, Percy admitted. I’ve got a man satchel full of macrobiotic beef jerky, though.
The whale shuddered. Promise not to feed me this, and I will take you north.
Deal.
Soon Percy had made a makeshift rope harness and strapped it around the whale’s upper body. They sped north under whale-power, and at Hazel and Frank’s insistence, Percy settled in for a nap.

The Son of Neptune, Chapter XXV