Of some interest would be the classified military technology which may be used for finding enemy underground hangouts. Ability is enhanced if sensor equipment on ground overhead.
Seismic sensors may be attached to undeground robots.
Sonar, as in sunmarines, for guidance and control.
The wolf in sheeps clothing gives missiles away to randomly fire at civilian terrtory while accusing another of war crime.
US needs to test its equipment if ever any need to check out Iran's military sunterranean labyrinths.
Extreme depth similar to looking for oil, I guess.

Refraction prospecting uses refracted waves from near-surface explosions and subsurface layering. It is detailed on a smaller scale, particularly for unknown geology. It is a powerful tool of petroleum seismology and theoretical seismology for investigating the basement, depth and crustal structure.

The generation of seismic waves involves explosion of a dynamite charge in a hole or weight dropping. Truck mounted mechanical vibrators (Vibroseis) to pass an extended vibration of low amplitude into the ground and continuously varying frequency between 10 and 80 Hz. In marine seismic study, an electric or gas spark or air gun shot is used as an energy source. Device used to detect and receive seismic ground motion are called “Seismometer” or “Geophone.” It is an electromechanical device used to convert mechanical input (seismic pulse) into electrical output and ultimately produce a continuous graph “Seismograph.” The modern seismic survey simultaneously records ground motions receiving from all directions due to combinations of transverse and longitudinal waves by a three-component geophone

On Sunday, November 12, 2023 at 9:39:38 AM UTC-6, Lazarus Cain wrote:
> Of some interest would be the classified military technology which may be used for finding enemy underground hangouts. Ability is enhanced if sensor equipment on ground overhead.
> Seismic sensors may be attached to undeground robots.
> Sonar, as in sunmarines, for guidance and control.
> The wolf in sheeps clothing gives missiles away to randomly fire at civilian terrtory while accusing another of war crime.
> US needs to test its equipment if ever any need to check out Iran's military sunterranean labyrinths.
> Extreme depth similar to looking for oil, I guess.
>
> Refraction prospecting uses refracted waves from near-surface explosions and subsurface layering. It is detailed on a smaller scale, particularly for unknown geology. It is a powerful tool of petroleum seismology and theoretical seismology for investigating the basement, depth and crustal structure.
>
> The generation of seismic waves involves explosion of a dynamite charge in a hole or weight dropping. Truck mounted mechanical vibrators (Vibroseis) to pass an extended vibration of low amplitude into the ground and continuously varying frequency between 10 and 80 Hz. In marine seismic study, an electric or gas spark or air gun shot is used as an energy source. Device used to detect and receive seismic ground motion are called “Seismometer” or “Geophone.” It is an electromechanical device used to convert mechanical input (seismic pulse) into electrical output and ultimately produce a continuous graph “Seismograph.” The modern seismic survey simultaneously records ground motions receiving from all directions due to combinations of transverse and longitudinal waves by a three-component geophone
Underground, like underwater warfare, has its pitfalls.
Not many German submariners survived as all German underwater firepower wiped out.
Those above surface more easily eat, drink, breathe the fresh air and can enjoy the light of day when there is no power..