User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-67.42.242.115-20130701044352/@comment-3146930-20130707151905

Artemis tells Percy that Athena is going to check on the Titans that are in their various prisons, but never actually states that she is going to Tartarus. I mean Prometheus' punishment was to be chained to a rock and had his liver fed to vultures. Atlas was tasked with holding up the sky. Oceanus as well was the Titan of the sea, but wasn't really part of the original war. Instead, he was apparently just resting at the bottom of the sea because he eventually joined Kronos and was fighting Poseidon in The Last Olympian.