In an article, thorough investigation NYT refers to the phrase “thorough investigation” as used in a New York Times report. It generally refers to a thorough, keen and attentive analysis of events, facts or issues. To take one of the examples, when the NYT article talks about the deep investigation, it means that the reporters or governmental bodies studied the issue carefully, verified various sources and discussed all the details that they found to make sure they do the right and the valid coverage.