In the first shiur, Rabbi Triebitz begins to study the Netzivs introduction to his Commentary on the Chumash (HaAmek Davar) entitled Kidmas Haamek. There the Netziv speaks about Esoteric/Exoteric interpretation of Torah and we discover his secret agenda
Here is a link to the HaAmek Davar from HebrewBooks.org
Here is another link from Wikitext which is not a pdf
Even though the work is normally known as HaAmek Davar (and even though sometimes it is punctuated as such on the title page), Rav Herczeg pointed out to Rabbi Triebitz that his first work was named HaAmek Sheila, where sheila is a verb. If so, this work should follow the same pattern and daber must be a verb.