It’s not like they are advertising specific mine placement. They showed pictures about trenches, anti-vehicles barriers, gates, etc. This stuff isn’t hidden, a guy with a camera at the border could spot everything, let alone aerial or satellite imagery. It’s about hardening the border and slowing down invaders. Then you layer it with more complex defense systems to support the static defense.
It’s not like they are advertising specific mine placement. They showed pictures about trenches, anti-vehicles barriers, gates, etc. This stuff isn’t hidden, a guy with a camera at the border could spot everything, let alone aerial or satellite imagery. It’s about hardening the border and slowing down invaders. Then you layer it with more complex defense systems to support the static defense.
Also, there’s a cost to keeping things secret in general. If you rely on something being a surprise, that’s one thing, but…