a man is underwater sitting at the bottom of the pool
The man is completely covered with water.
A person who is completely covered in water is necessarily underwater.
exists e1 p1 x1 x2 x3.(n_pool(x3) & n_bottom(x2) & exists e2.(at(e2,x2) & of(x2,x3) & Actor(e2,x1) & v_sit(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_underwater(e1) & n_man(x1))
exists e1 s1 x1 x2.(n_man(x1) & a_completely(s1) & Manner(e1,s1) & with(e1,x2) & n_water(x2) & Theme(e1,x1) & v_cover(e1))