How to Get Gas Mask Guide for Metal Gear Solid (MGS1)
Found in Nuclear Building B2 on the 3rd room
You can get the Gas Mask in Metal Gear Solid (MGS1) at the the third room from the top of the central corridor, B2 of the Nuclear Conservation Building and it requires an ID card Lv3 to have access on that room.
How to use Gas Mask
Slows down the O2 gauge
Gas Mask is an item that slows down the depletion of your oxygen when you are inside a room with a toxic gas.
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