Tunnel Detection Technology: Should be able to detect dormant tunnels upto 10m in depth

In the recent past, few tunnels have been detected on Western borders with Pakistan. Detection and imaging of underground tunnels is a big challenge specially in the context of border security as enemy can use his territory to dig a tunnel and open it deep inside our country behind own border security line to clandestinely infiltrate and smuggle narcotics, explosives, arms or ammunitions.
Solution should have the following:
      1.    Should be able to detect dormant tunnels upto 15m in depth
      2.    Should be able to detect exact location of any movement inside the tunnel at a distance of at least 100m.
      3.    Portable and easy to operate system with user friendly GUI giving exact direction and distance of the source of movement/ sound