**4. Theories**

• *Myer-Overton:* when inert gas is dissolved in the nervous system, the inert gas has an inhibitory effect on the nervous system.

• *Quastel-Metabolic:* at high pressure, inert gas disrupts cell metabolism. These sensitive cells are mostly found in the brain. The cells, which are consciousness formation, are the first to be affected.

• *Clathrate:* under pressure nitrogen creates clathrate with protein and water. This formation disrupts neural transmission.

• *Iceberg:* when nitrogen gas dissolves in water, it creates molecules called icebergs. The iceberg also prevents the transmission of the nervous system like the same clathrate [4].
