Do you know how heavily militarized that area is, particularly with the Navy, and with the scale of operations from San Clemente Island? It's a freaking sonar base, a major training facility for Navy SEALs, as well as facilities for the USAF and the USCG - among other things.
You're crazy if you think there's any way China or Russia, given the sophistication of their own fleets - can hide out undetected in the channel between Catalina/U.S. coastline. And if they can and not be picked up on radar - the the U.S. is truly in trouble.
Of course, to make a suggestion that China or Russia can penetrate that area would imply that you have more information on the subject, and I invite you to explain how a Yasen-class or Jin-class submarine (or lesser models) could operate in the area undetected.
|