the.com/oceanologist

means A scientist who studies the ocean — its physics, chemistry, biology, and geology, from currents and tides to the creatures and crust beneath them.

from Built from 'ocean' (Greek 'Okeanos,' the titan embodying the vast river thought to encircle the world) plus the familiar science-suffix '-ologist' ('one who studies,' from Greek 'logos,' meaning word or reason. The term itself is a fairly modern, functional coinage — no myth behind the compound, just Greek roots bolted together to name a field that only really became its own discipline in the 20th century, once submarines, sonar, and research vessels made the deep sea something you could actually study rather than just sail over.