Objects
Ephemycron is an ancient navigational tablet. It aligns with the stars and various markers around the world, placed by Lemurians, before then projecting a map which gives the locations of various points of interest, such as dangerous places to avoid, the locations of Monumentials, and other special sites. The first season revolves around the hunt for all three pieces of it, even though it is only introduced in "The Test". It is the main way of opening the gates of Lemuria, and only the youngest person in each line of the Lemurian royal family (Ant and Alpheus) can operate it.
The Chronicle of the Deep is a kind of scroll that contains information about the Lemurian culture and associated artifacts and locations. It was hidden in a cave within an ocean trench, retrieved by the Nektons in "Here Be Dragons". There are several different ways to open it, each of which reveals a different part of the Chronicle.
The Sceptre of Queen Dorieas, also known as the Queen's Sceptre, is the only way of truly controlling the Monumentials and is the only way of returning them to their millennia-long sleep after they have awoken. The third season revolves around getting possession of it and using it for the first time. It activates when exposed to water and can reassemble itself if broken, as well as adhere to the hands of the person who is able to wield it.
Knights are mechanised suits built by Professor Fiction for use by the Nektons. The White Knight, the first to be introduced, is the simplest design. The Shadow Knight is fast (90 kilometres per hour (56 mph) top speed) and has a stealth mode. It is usually used by Ant. The Swamp Knight is a large amphibious Knight model (the other Knights sometimes also walk on land). The Mag Knight, usually used by Will, is the largest and most powerful. The Mimic Knight is a fast and agile Knight which somewhat resembles a mermaid, with an ability to "see" using echolocation and to change colour to blend in with other marine creatures. The Mimic Knight is usually used by Fontaine. The Jeffery Knight is a small fish bowl on a chassis and wheels, which Jeffery can use to get around when out of the water or to give extra protection outside the Aronnax, and is controlled by his swimming. The Knights are usually made from carbon fiber composites.
Aronnax is the Nektons submarine. Described as the "world's largest submarine", it serves as the Nektons home, additionally containing a library, medical bay, laboratory, kitchen, several bedrooms, a moon pool, and various other facilities. It has a system of tubes and cavities connected to fish tanks in several rooms, which Jeffery can use to travel around the submarine. It has a "water-powered" engine, and batteries, as well as a traditional screw propeller for forward propulsion, giving it a top speed of 80 kilometres per hour (50 mph). Its hull is made from titanium, allowing it to withstand high temperatures and highly corrosive environments. Aronnax could have been named after Profesor Pierre Aronnax, the character of the book 20 000 Leagues Under the Seas by Jules Verne.
