People in a dark subway tunnel.
People are in a tunnel.
A tunnel is usually a dark subway.
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_tunnel(x2) & of(x2,x3) & n_subway(x3) & a_dark(s1) & Theme(s1,x2) & n_people(x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_tunnel(x2)) & n_people(x1))