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The Chambered Nautilus, also known as the Emperor Nautilus (Nautilus pompilius), is a species of nautilus found in both Endless Ocean and Endless Ocean 2.

The chambered nautilus gets its name from the fact that it builds its shells in sections, or "chambers", as it grows. It is the only modern species of nautilus that appears in either of the Endless Ocean games.

Encyclopedia Description

Endless Ocean

“These creatures have helical shells with dozens of protruding tentacles. The shell is white with radial marks of reddish brown. They appear at night in a secret location.

They propel themselves along by expelling water through funnel-shaped feelers. Their eyes, however, are small pinholes that lack a crystalline lens--which means their vision is very poor.

Their shells contain a section for the main body, as well as numerous smaller areas that are connected by narrow ducts. These secondary chambers are filled with low-pressure gasses and liquids that they use to adjust their buoyancy. The genus name Nautilus means “sailor” and was also the name of the world’s first submarine.”

Endless Ocean 2

"Its spiral shell has a radial pattern of red-tinted brown lines. It has so-called pinhole eyes, which have no lens and leave it with poor eyesight. Its ancestors lived about five hundred million years ago, when ammonites and other large species thrived. However, their numbers fell due to subsequent climate change, natural selection, and other factors, and only the Nautilidae family survived to the present day."


Endless Ocean


  • In the Abyss, a couple can be found in front of the entrance to the Fiend's Cave, only at night.
  • In the Underwater Ruins of Mo'ia Atoll, another group can be found in a small tunnel connected to the exterior maze, swimming in front of a stone tablet at G-5, and also only at night.

Endless Ocean 2

One can be found in the Cavern of the Gods, at the opening to the Subterranean Reception Room from the Altar of Horus (at coordinates B-2).


These small creatures float around slowly and aimlessly. They like being fed.


Real-Life Information

  • Like both games report, the chambered nautilus does not have very good eyesight due to its "pinhole" eyes that lack a cornea or lens[1]. Though the chambered nautilus has the most highly-developed version of this kind of eye in the animal kingdom,It is only really able to tell the difference between light and dark[2][3].
    • Because its eyesight is no good for hunting, it tracks down prey with a good sense of smell[4]. It likes shellfish and crustaceans, but it also eats carrion from other animals' hunts or from natural deaths[5][6].
  • The chambered nautilus gets its name because it builds its shell into distinct "chambers" as it grows[7]. These chambers are filled with gasses and liquids that help the nautilus maintain its buoyancy (float up or down when it wants) and stay upright in the water[8]. They are connected by specialized tubes called "siphuncles" (the "ducts" mentioned in the first game's description)[9][10].
    • The mechanism by which the chambered nautilus controls its own buoyancy inspired the inventor of the first modern submarine to name it the "Nautilus"[11].
  • Like the second game says, the ancestors of the modern nautilus lived about 500 million years ago[2][8]. The modern family Nautilidae is the only representative of the Nautiloidea, or nautiloids, that has lived until today[12]. However, humans pose a threat to the nautilus' current existence, as its shell is very sought-after for decoration and fashion[13][14].
    • Though there are six species total in the modern genus Nautilus, the chambered nautilus is the only one to appear in either of the Endless Ocean games[6][15].
  • Chambered nautiluses live for a very long time when compared to other cephalopods (squids, octopi, cuttlefish, and nautiloids) - about 20 years on average[1][2]. Nautiluses are also the only cephalopod species to reproduce more than once, as the others others reproduce a single time and then die (which shortens their lifespan considerably)[6][12].
  • The chambered nautilus is also called the emperor nautilus or pearly nautilus[4][5][10].