"deep penetration" is a correct and usable part of a sentence in written English.
You can use it to represent something penetrating to a significant degree, often used metaphorically. For example: "He had a deep penetration of the market."
He supports the investigation of alleged "deep penetration" by the Muslim Brotherhood of the US government.
Although it absorbs to some extent, it rarely allows the deep penetration necessary for drug delivery.
"Our high-performance Brass Jacket Hollow Point rounds deliver massive expansion and deep penetration for ultimate stopping power".
The Sri Lankan army has recently scored some successes with "deep penetration units", which have killed several senior Tigers.
Although no evidence of earlier campaigns survives, the Nubian text implies that deep penetration of Syria had already occurred.
As allied forces reported sweeping victories and deep penetration into Iraq, Mr Bush went on television to declare 'Kuwait is liberated' and Iraq's army defeated.
"The deep penetration in those critical markets" like metropolitan Chicago, Los Angeles and New York, she added, is intended to "surround consumers by different points of contact".
This novel truly brings out awareness to the African society about the deep penetration of colonialism and the ways it has negatively affected them.
It is a measure of the deep penetration of propaganda in to every medium of expression in wartime Vietnam that few proper names serve merely as names.
"Aviation is an industry where we as consultants have very deep penetration," said Scott Hartz, global managing partner of the management consulting-services practice at PricewaterhouseCoopers.
It also revealed her propensity for making gaffes and outlandish accusations, such as her claim that the Muslim Brotherhood had "deep penetration" within government.
