How does Master Chief pee? An investigation - Polygon
Master Chief and the Spartans of Halo have to pee sometime: The question is how? But also when? And where? Halo developer 343 Industries gives us the official, technical, in-depth answer.
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Who would win: Master Chief, Doomslayer, Commander Shepard, Samus Aran, Marcus Fenix, or Isaac Clarke? All equipment allowed. - Quora
How does Master chief pee? Polygon got an article for you(link in comments) : r/halo
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Halo: Things Only Super Fans Know About Master Chief's Body
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The Polygon staff draws their own custom Master Chiefs - Polygon