dig down into

See: delve
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Former Evening Telegraph reporter Dermot Murnaghan has been invited by Radio 4 to dig down into dialect and connect with speakers across the UK to find out how local local talk really is.
It's certainly likely that I missed some fellow travelers on the Greyhound line, and maybe some filmmakers at the festival really do dig down into the mine of their own experience.
* When their pools dry up, the frogs dig down into the sandy soil and spend many months underground.