I'm reading a lot of paranoid stuff in this thread.
There is no point in any of our security systems that is, by itself, secure. But our security systems are layered.
At each point in the shipping chain, inspections are carried out and the results documented. At each inspection point, inspectors and/or workers perform their checks.
Even if one, two or three agents were to be placed in the shipping chain, there is not a whole lot they could do insure a particular container were routed around foreign port inspections, at sea inspections and off-shore and US ports inspection.
You would need a huge conspiracy to do that.
Beyond that, these inspections are taking place in the Bahamas. Those same containers are subject to inspection once they hit our ports.
It's just another layer of security, it seems to me.
As far as getting a nuke into the country, a container would be the last tool I would use. I can think of a number of ways to get a nuke into the country that would end-run all inspections.
"Who or what is the "they" you write about?"
Do yourself one BIG favor. THINK LIKE A TERRORIST FOR A WEEK and then ask your STUPID questions. You'll find they are so obvious that there isn't any more questions about how to destroy America. We are doing it ourselves!
Do you have any military background at all? Did you ever play war games when you were a kid?
The people who run the devices. People who work for for a Chinese company who could be told that this special container doesn't need to be checked.