The idiomatic expression "to dig deeper" means to investigate or explore something more thoroughly, often in order to uncover hidden information. Full definition
That's not to say that other curriculum options aren't theological, only that these weekly lessons will be known primarily for digging deep into biblical theology. (christianitytoday.com)
Basic Obedience is not enough, it isn't challenging enough, and doesn't dig deep enough into the dog's soul to effect this kind of character transformation. (samthedogtrainer.com)
Instead, the emphasis should be on digging deep for the documents and data that really matter. (canadianlawyermag.com)