"probe deep into" is a correct and usable phrase in written English.
You might use it when you are talking about someone exploring an issue in detail or when someone is asking a lot of questions in order to obtain information. Example: We need to probe deep into the issue in order to find a solution.
Announcing "I've been to the zoo," Jerry proceeds to probe deep into Peter's life.
Some readers will find Duncan's hyped-up, performative language thrilling, a probe deep into the heart of our age.
But addictive and depressive illness seems to probe deep into the relations between individuals and those around them.
Joel and Ethan Coen model the flight and quest after Homer's "Odyssey," but the wily brothers take a few liberties to indulge their urge to probe deep into the American grain.
Evaluation / Assessment: Students will be evaluated based on initial journal responses, thoughtful participation in class discussions, cooperation in small groups, accurate construction of scale models of Earth, appropriate demonstrations of the concept of density, and creativity in writing a skit proposing plans to send a probe deep into the Earth.
This encore presentation of a "Nova" episode explores that question by following a drilling probe deep into the ice, down through the water and three-quarters of a mile into the seafloor to recover rock from a time when the Earth was a few degrees warmer than it is now.
That's a shame: he should probe deeper into the faultlines between O'Reilly and Dapper.
Probe deeper into the relationships between business and politics, and newspapers may reveal things that everybody doesn't know.
If we probe deeper into what is and what is not literature, we find many questions and no solid answers.
He agreed, though, that it likewise has the potential to turn "creepy," with computers managing to probe deeper into our minds than any person could.
The advancement of CCTV, unmanned aerial vehicles and so on will give the police an unprecedented opportunity to probe deeper into people's private lives.
