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Amnio Tank
Machine Information
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Used by


Behind the scenes
First appearance


The Amnio Tank is a tank that controls the growth of an avatar body during transport from Earth to Pandora.


The controlled environment of the amnio tank was originally developed to replace functions of the mammalian womb. It is used for growing cloned animals, humans (rarely) and (most commonly) replacement limbs and organs. It is now used with great success to grow avatar bodies that are genetically linked to their controllers. This, in turn, allows for an effective psionic link between the human controller and the cloned avatar.

The growth takes place in a suspension fluid, a mostly inert substitute for amniotic fluid, kept at a controlled temperature and with constantly monitored composition. One or more placentiums, which function similarly to a mammalian placenta, supply nutrients and hormones to the organ or creature being cultivated. Monitoring equipment closely controls the nutrients, growth stimulants and other materials supplied via the placentium. Avatars in amnio tanks are also supplied with a synthetic umbilical cord, used to provide blood to the body.

Usage on Earth[]

Cellular rebuilders, found at many large Terran hospitals that serve clients with alpha-level insurance coverage, are modified amnio tanks. Clients suffering from serious injury or organ failure are put into an induced coma, connected to a placentium, then immersed in the rebuilder tank where reconstruction at a cellular level is performed under nanobotic control.

Amnio tanks range in size from the one-pint “Digigrow” found in many doctor's offices as an outpatient service, to the converted dry dock at Anchorage Naval Yards currently being used as part of the Ocean Phoenix whale revival project.

Usage by the Avatar Program[]

The amnio tanks used in the Avatar Program are unusually large, to accommodate the Na’vi-like creatures they are built to create. A standard human amnio tank is about 2.2 meters long and holds about 570 liters of fluid. An avatar tank is 385.82 centimeters long, 148.4 centimeters wide, and holds nearly 6,350 liters of fluid. In addition, the avatar tanks are designed to be portable, since most avatar growth takes place on the interstellar vehicle during transit to Pandora.

Thanks to the long duration of the journey (almost six years Earth time), less aggressive growth stimulants are needed to bring the avatar to full adult stature than would usually be necessary; most organisms grown in amnio tanks on Earth are completed within six months.

More “natural” growth to full size avatars meant that the research that essentially duplicated the experiments carried out on terrestrial mammals, did not have to be performed, and also reduced the complexity of the amnio tanks' monitoring system.

One difference between Earth organisms and those found on Pandora is illustrated by the composition of the fluid in the amnio tank – the avatar amnio fluid is a relatively strong alkaline solution, rather than the simple saline that is the base of terrestrial amnio fluids. Indeed, it is so strong that most Earth organisms would be largely dissolved in a few weeks of immersion, and human technicians decanting fully matured avatars are required to wear gloves and protective eyewear during the process. Xenobiologists have discovered that avatar amnio fluid reflects the composition of Pandora's oceans, which are also somewhat caustic.