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Oxygen tank

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MG1 O2 cylinder

An Outer Heaven oxygen tank.

An oxygen tank, sometimes referred to as oxygen cylinders due to their shape, is a specialized tank containing oxygen used primarily for breathing underwater. It is often used by the military for underwater insertions, although it can also be used for either mental recuperation for elderly citizens or physical recuperation for people who were left significantly injured.

Usage

Paz Ortega Andrade, real name Pacifica Ocean, used an oxygen tank while using Metal Gear ZEKE due to the cockpit flooding. Pacifica also was trained to use it under deep-sea diving training.

Circa March 21-24, shortly after Kazuhira Miller's rescue from Da Ghwandai Khar and his being safely brought back to the new Mother Base, he was hooked up to an oxygen tank alongside an oxygen mask when placed onto a stretcher, in order to recuperate from the significant injuries that Miller had sustained while in captivity and presumably when he was ambushed by the Parasite Unit.

During the 1990s, FOXHOUND used oxygen tanks to train its operatives in diving and underwater infiltration. Solid Snake, during his FOXHOUND training, also managed to master this drill.

Oxygen

An Zanzibar Land diving tank.

Outer Heaven and Zanzibar Land used oxygen tanks that were presumably used for work relating to waterways. Solid Snake, during the Outer Heaven Uprising and the Zanzibar Land Disturbance, made use of these during his missions after procuring them.

The lifeboats of the USS Discovery contained oxygen tanks so that it could supply even the ones not outside the boat with oxygen to ensure everyone's survival.

Solid Snake and Raiden also used oxygen tanks when doing an underwater insertion into Shadow Moses Island and the Big Shell during the Shadow Moses Incident and the Big Shell Incident, respectively.

Solid Snake also used an oxygen tank during the USS Missouri briefing during the Guns of the Patriots Incident, namely as a means of recuperating after his battle with Liquid Ocelot and his nearly being killed by Outer Haven.

Behind the scenes

"Oxygen Cylinder
Using the oxygen cylinder in the water will preserve your LIFE gauge.
"
―— O2 Cylinder description in Metal Gear

The oxygen tank was an item used in the MSX2 games, and was the only thing that allowed the player to access the second part of Building 2 in the player, as it had a large part of the base was separated by a large and deep waterway.

In the non-canon sequel Snake's Revenge, the oxygen tank returns, this time as a renewable procurable item akin to the rations, grenades, and ammunition boxes. These were used for the side-scrolling portions of the game, and a maximum amount of oxygen tanks are especially needed for the final side-scrolling portion of the game.

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