Feds aiming to make border wall 30 feet tall

The agency provided 11 threshold requirements for the wall, which it says “shall be physically imposing in height.” The wall needs to be 30 feet tall — although “heights of at least 18 feet may be acceptable” — and it should prevent tunneling by going at least 6 feet below ground.

The wall, it adds, should be difficult for getting over and offer features that prevent “sophisticated climbing aids,” such as grappling hooks and building handholds.

Prototypes will also need to prove that they aren’t susceptible to a “physical breach” via a “sledgehammer, car jack, pick axe, chisel, battery operated impact tools, battery operating cutting tools, Oxy/acetylene torch or other similar hand-held tools,” the CBP document says.