Possible Results:
haya avistado
-I have sighted
Present perfect subjunctive yo conjugation of avistar.
Present perfect subjunctive él/ella/usted conjugation of avistar.

avistar

Por eso, sin que jamás una sonda de mar profundo la haya avistado, esta criatura siempre permaneció desconocida para el hombre.
Thus, unless a deep sea exploration cell were to take sight of it, it remained unknown to man.
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