A bulldozer works on a large excavation.
The massive hole in the earth is being made by a large piece of equipment.
If there is an excavation,  it would follow that there is a hole. A bulldozer is equipment.
exists e1 s1 x1 x2.(on(e1,x2) & n_excavation(x2) & a_large(s1) & Theme(s1,x2) & Actor(e1,x1) & v_work(e1) & n_bulldozer(x1))
exists e1 s1 s2 x1 x2 x3 x4.(n_earth(x2) & n_hole(x1) & a_massive(s1) & Theme(s1,x1) & Actor(e1,x3) & of(x3,x4) & n_equipment(x4) & n_piece(x3) & a_large(s2) & Theme(s2,x3) & Theme(e1,x1) & v_make(e1) & in(x1,x2))