[Lizavetta]

Height is just one factor. You also need multiple barriers, razor wire, trenches, electronic detection, and guards with shot-to-kill orders.

I've always believed that the greatest deterrent is NO BENEFITS OF ANY KIND. If they cannot get welfare, housing, medical or schools, they won't come.

[SolidWood]

Each “unaccompanied refugee minor” reportedly cost the German taxpayer 100 grands each year.