A snorkeler is under the water taking a picture.
Scuba diver photographing underwater.
The diver is photographing underwater because he is under the water taking a picture.
exists p1 x1 x2.(n_water(x2) & exists e1 x3 x4.(under(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_take(e1) & n_picture(x4) & (x2 = x3)) & n_snorkeler(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_photograph(e1) & n_underwater(x4) & (x1 = x3) & n_diver(x1) & (x1 = x2) & ne_nam_scuba(x2))