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Detection abilities too, what does the american government know and the pentagon know about what this -- what causes this explosion? >> i don't think we know exactly what caused it but we do know that they are exploring technology that the united states abandoned because they didn't think it was achievable, to put a small nuclear reactor an out cruise missile which would give it unlimited range not inhibited obviously by fuel source and also make it quite penetrable in terms of breaking through defenses. we gave that up years ago, the russians have been at this for some time, they had a major ...

The use of the kinds of satellites and other detection abilities that don't involve a physical wall. >> thank you for stopping by on this holiday weekend. i hope you had a good one and a good week ahead. i want to bring in elliot williams. he's worked as a former assistant direct for i.c.e. under president obama. as we look at what's happening hear on the boarder. you having worked with i.c.e., these are different days and different weeks. what's your take away when you see all of that activity right there across from san diego? >> i think the biggest problem when you think about what it mea...

>> reporter: yeah, you're right. the batteries have been slowly fading over time and maybe the signal may be getting more weak as we go. as far as the detection abilities of the towed pin gger locator, there's another piece of technology on board called the blue fin. it's an underwater drone that can actually scan the bottom of the ocean floor looking for debris. these are two tools that were supplied by the united states navy. they are some of the best technology available when it comes to a search operation like this. but again, the problem is, if you don't have a narrow search area, this is...