A person is swimming underwater in a pool.
A human swims under the pool water.
A person is a human and underwater in a pool is the same thing as under the pool water.
exists e1 x1 x2 x3.(in(e1,x3) & n_pool(x3) & Theme(e1,x2) & Actor(e1,x1) & v_swim(e1) & n_underwater(x2) & n_person(x1))
exists s1 x1 x2 x3.(n_water(x2) & of(x2,x3) & n_pool(x3) & a_topic(x1) & under(x1,x2) & n_swim(x1) & a_human(s1) & Theme(s1,x1))