[tansanrao]

I suppose this would depend on the context. As a PhD student, I primarily focus on building an understanding of systems through existing literature, so I would define a deep dive as a sufficiently thorough explanation of the system, its motivation, and it’s history.

In the case of XNU and Darwin, a lot of the sources are also blog posts from reverse engineering efforts by security researchers and jailbreaking communities so it blurs the lines.