Archaeologists are on the ground digging for something.
someone is digging in the ground at a new dig sight
Just because the archaeologists are on the ground digging for something doesn't mean it is a new dig sight. It might be the same site they've been digging in for the past 3 weeks.
exists p1 x1 x2.(n_ground(x2) & exists e1 x3 x4.(on(x1,x2) & for(e1,x4) & n_thing(x4) & Actor(e1,x3) & v_dig(e1) & (x2 = x3)) & n_archaeologist(x1))
exists e1 s1 x1 x2 x3 x4.(n_ground(x2) & at(e1,x3) & n_sight(x3) & of(x3,x4) & n_dig(x4) & a_new(s1) & Theme(s1,x3) & in(e1,x2) & Actor(e1,x1) & v_dig(e1) & n_person(x1))