He was here, and I believe his wife was, as well.
Apparently they have a good amount of protection 24/7, more when he's present. My bet is there are divers that sweep at least once daily; on-land protection watching 24/7 -- and they likely have really good aim.
Not coming from the military or protective services, there must be more than just that with some pretty neat high tech gadgets, to boot.
GB