By A Mystery Man Writer
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.
What if Master Chief came into contact with a marker? Do you think it would affect his mind or would he be resilient to its effects? : r/DeadSpace
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How does Master chief pee? Polygon got an article for you(link in comments) : r/halo
Does Halo's Master Chief Pee in His Suit? Apparently Yes
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Who would win: Master Chief, Doomslayer, Commander Shepard, Samus Aran, Marcus Fenix, or Isaac Clarke? All equipment allowed. - Quora
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The Polygon staff draws their own custom Master Chiefs - Polygon
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How does Master chief pee? Polygon got an article for you(link in comments) : r/halo
How does Master Chief pee? An investigation - Polygon