had submerged
-había sumergido
Past perfectconjugation ofsubmerge.There are other translations for this conjugation.

submerge

For four hours, the ROV climbed the sandy slopes speckled with rocks from the 200 meters depth we had submerged it, up to 80 meters.
El ROV va ascendiendo durante cuatro horas por la ladera de arena gruesa salpicada de rocas desde los 200 metros de profundidad a la que lo hemos sumergido hasta los 80 metros.
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