Methane tank

Methane Tank

The Methane Tank is a device that the Grunts use because they can't breathe oxygen like the other members of the Covenant.

A Grunt With A Methane Tank On

The Heretic Grunts can be seen with a more visabile Methane Tank.

Without Methane Tank

A Grunt is not seen in the games withound the tanks. However there is a picture without one.

File:Grunt.jpg

A Grunt without Methane Tank

However if a Grunt was to not wear a tank they would suffocate in an oxygen atmesphere.