Derec
Contributor
The terror tunnels from Gaza into Israel are a huge problem, as are tunnels going to Egypt that are used to smuggle things like rockets and explosives. So why not dig a big-ass moat all around Gaza? 50 m (i.e. length of an Olympic swimming pool) wide, about the same deep. Of course the terrorists could go deeper but it would be much more difficult and expensive for them and also the tunnels could be made permanently inoperable by simply blowing up the section under the moat and flooding it.