I'd be tempted to start digging it all up. Someone's after something important enough for them to go through the trouble of the physical labor, working at night, and the possibility of physical and legal danger. If you don't want to dig it up, I'd wait for them.
The reason I'd wait is to have them do the work for me. Once I saw what it is they were after, I would decide my next move.
Plz keep us posted.
Careful, it may be aliens. These are diggers, not crop circle makers.
Or wait! Could be the worms from Tremors! Or mutant prairie dogs! The dead rising!!!!! OMGFUCKAAAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :zoom: