deep dive
A thorough analysis, perhaps one that seems excessive or unwarranted for a particular topic. When you get a chance, check out the magazine's deep dive on the upcoming vote. It covers every angle. Wow, they really did a deep dive on eye shadow in that article. It was 20 pages long! I did a deep dive on the file mix-up, and I found some very interesting, maybe even nefarious, things.
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