Build a moat!
http://news.bbc.co.uk/1/hi/world/middle_east/3816591.stm So Israel wants to build a moat between gaza and egypt to help prevent arms dealers from smuggling weapons across the border. The plans are for it to be around 2.5 miles long and anywhere from 45~90 feet deep. How wide was not mentioned.
Seriously... do they not think that the arms smugglers will not just bring a boat? These are people are funded with millions of dollars. Let's build a moat...