Location from Sword Art Online by Reki Kawahara
Rath's floating research base — a military vessel disguised as a marine research platform where artificial souls are grown, tested, and prepared for warfare.
The Ocean Turtle is where the real world and the Underworld intersect. Rath's engineers monitor the simulation from here, Kirito's unconscious body is maintained in an STL pod here, and the military's interest in artificial intelligence soldiers operates from here. It is simultaneously a research laboratory, a hospital, and a weapons development facility. When Gabriel Miller's team assaults the Ocean Turtle, the facility becomes a battlefield — and the fragility of the Underworld's existence becomes apparent. If the servers go down, every Fluctlight dies. The entire civilization depends on a ship full of engineers and a military budget.
A massive, turtle-shaped offshore platform anchored in the Pacific. It looks like a cross between an oil rig and an aircraft carrier, with a flat deck, multiple antenna arrays, and a submerged hull section containing the main computer systems. The interior is military-utilitarian: steel corridors, server rooms humming with cooling fans, and the STL (Soul Translator) pods where operators dive into the Underworld.
Also known as: Ocean Turtle, Rath HQ