I had plunged
-había sumergido
Past perfect conjugation of plunge. There are other translations for this conjugation.

plunge

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When my eye started to shrink, affected by the noxious environment, I realized what I had plunged into.
Justo cuando mi ojo comenzó a encogerse a causa de la nociva atmósfera, me di cuenta de dónde acababa de hundirme.
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