For the source text click/tap here: Pesachim 80
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The Mishnah states that the Tzitz is not Meratzeh for Tum'as ha'Guf (Tum'ah of the person who offers the Korban, in contrast to Tum'ah of the animal or its blood, or Tum'ah of the utensils used for offering the Korban).
thus if one became ritually impure through impurity of the deep, the frontplate (tzitz) appeases God (ritzui).
this leads us to consider the tuma'ah of the Tehom (deep) and the anthropology of purity laws cross culturally and the work of Mary Douglas.