They swim laps across the pool.
People are swimming in the ocean.
Are they in the ocean or a pool?
exists e1 x1 x2 x3.(n_pool(x3) & n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_swim(e1) & across(x2,x3) & n_lap(x2))
exists e1 x1 x2.(n_ocean(x2) & in(e1,x2) & Actor(e1,x1) & v_swim(e1) & n_people(x1))