From the introduction:
Mankind has often wondered what secrets lie hidden in the depths of Earth's oceans. But throughout our history, this most tantalizing of mysteries remained unknown. Finally, in the 22nd century, the technology exists to explore, even colonize, the planet's vast underwater realms.
Under the Sea
The fifth Trinity Field Report: Oceania takes a look at Earth's ocean-based societies. From the vast floating cities to the isolated deep colonies, this full-color setting dossier from the Æon Trinity itself reveals the bizarre and wondrous world that exists beneath the waves.