Desperate people always find a way. In 1979:

Harrowing Flight From East Germany

…Three hours later, after a 28-minute, 15-mile flight in a home-made, hot air balloon that, they hoped, had carried them and their families across that border and into a farmer’s field, the two men ran toward a stunned policeman, shouting, “Are we here, in the West?” They were…

Representative Vicky Hartzler (r) [2016 file photo].

Yesterday, via Twitter:

Rep. Vicky Hartzler @RepHartzler
(2/2) We need to ensure border patrol agents have tools to efficiently remove illegal access to USA. Waiting for environmental reviews of drug tunnels that have already disturbed ground & will ultimately be filled with concrete is unnecessary & threatens our national security.
11:27 AM · Jul 25, 2019

And, a response wins the Internets:

Thomas Vought @TomVought
Replying to @RepHartzler
So what you’re saying is that the Great Wall of Trump won’t work because people can dig underneath it? Wait till you find out about ladders.
3:13 PM · Jul 25, 2019

Creativity and imagination always find a way.