There is no wall that could be designed and built that could not be breached somehow. But making it very difficult deters the easy crossing and restricts the effort to organized operations, which are easier to detect and stop. (IMO)
For instance, the cylinder at the top with a vibration sensor and alarm would alert people that a rope or cable has been landed on the top of the wall. It's going to take a while to hoist people up 30 feet. We should be able to get people to the location before they can get too many bodies over the wall. Fill the foundation with sand and piles to prevent tunneling. The size of the hole and the time it takes to excavate it could be observed by daily inspections.
This type of "wall worked very well for over 50 years at keeping people in. It is equally suitable to keep people out with only a few minor changes.
High speed patrol road.
No-Mans land with anti vehicular and anti-personnel mines.
Anti-vehicular ditch
3 meter expanded metal fence supported by cement posts and armed with 3 levels of anti-personnel mines w/trip wires that shoot along the fence line.
Ask the East Germans. This fence works REAL GOOD.