Sightseers look across the water at a city.
The sightseers are viewing a wrecked ship underwater.
They are either looking at a city, or a wrecked ship.
exists e1 x1 x2 x3.(n_water(x3) & across(e1,x3) & at(e1,x2) & n_city(x2) & Actor(e1,x1) & v_look(e1) & n_sightseer(x1))
exists e2 e1 x1 x2 x3.(n_sightseer(x1) & Theme(e2,x2) & Actor(e2,x1) & v_view(e2) & n_underwater(x2) & of(x2,x3) & n_ship(x3) & Theme(e1,x2) & v_wreck(e1))