Like, if that tunnel is dug more than about three or four tunnel diameters beneath your house, you will not be able to detect it being dug at all. In fact, if you're able to detect the tunnel being dug, whatever device you are using, you can get a lot of money for that device from the Israeli military, who is trying to detect tunnels from Hamas, and from the US Customs and Border patrol that try and detect drug tunnels.
Si ese túnel se excava a más de 3 o 4 veces el diámetro del túnel debajo de tu casa, no serás capaz de detectar que se está excavando, de hecho, si eres capaz de detectar cuando se cava el túnel, uses el dispositivo que uses, puedes ganar mucho dinero si lo vendes al ejército israelí, que está intentando detectar túneles de Hamás, y de la aduana y guardacostas de EE.UU., que intentan detectar túneles de droga.