drill down

drill down (to something)

to bore downward to something or some distance. We drilled down to a layer of waterbearing sand, hoping to make a well. They had to drill down to bedrock to make a base for the piers that hold the building up.

Common Names:

Name	Pronounced	Usage
Heraclius	-	Ancient Greek (Latinized)
Mario	MAH-ryo (Italian, Spanish)	Italian, Spanish, Croatian
NİDa	-	Turkish
Alcippe	-	Greek Mythology (Latinized)
Christie	['kristi]
Ziegler	['zi:glə]