Egypt has begun constructing a huge metal wall along its border with the Gaza Strip as it attempts to cut smuggling tunnels. When it is finished the wall will be 10-11km (6-7 miles) long and will extend 18 meters ( 59 ft) below the surface.
The US Corps of engineers, who have reportedly designed the wall and helping the Egyptians in installing it
The wall will take 18 months to be completed . It is made of super-strength steel, cannot be cut or melted. Source: BBC