Now, as far as I knew, he (Luke) was still sailing around on...

Now, as far as I knew, he (Luke) was still sailing around on his demon-infested cruise ship while the chopped-up Lord Kronos re-formed, bit by bit, in a golden sarcophagus, biding his time until he had enough power to challenge the Olympian gods. In demigod-speak, we call this a “problem.” - Percy, 'The Battle of the Labyrinth