Aquanaut
Aquanaut derives from the Latin word aqua ("water") combine the Greek nautes ("sailor"), by analogy to the similar construction "astronaut". Approximately 70 percent of the Earth is covered by water such as an ocean, sea, lake or river. Underwater environment has a lot of potential sources which can enrich our lives. So, voyage to the under the sea was long-cherished desire of human and people imagine it even in science fictions or movies. An aquanaut is any individual who remains underwater, exposed to the ambient pressure, long enough to come into equilibrium with his or her breathing media. Usually this is done in an underwater habitat on the seafloor for a period equal to or greater than 24 continuous hours without returning to the surface. The term is often restricted to scientists and academics because super tiny malfunction of their equipment such as inaccurate mixture of gas for respiration calls fatal accident or illness.1 Thus, aquatic inventor devised various aquatic equipment from small and sophisticated object to large scale of habitats. In France, Cousteau developed three Conshelf habitat that provided an ambient-pressure dry environment with living quarters, research spaces, and dive platforms for work excursions outside.2 Desire of realization of the aquanaut not only influenced on development of advanced aqua equipment but also arouse the possibility of self-sustainable life in extreme environment.