Hmmm....

I teleported from City 17 (or the like) and got dropped in a lake,
with a couple of large half-sunken boats at the other end.  There
is one large multistory building that I've explored.  In it are
a couple of "pressure plates" in the floor that seem to drop when
nothing is on them, and rise to floor level when enough weight is
on them.  There is a big "6" on one of them that I can't move.
On the top floor, there is one room (where I got my shotgun) that
has an ant-lion replica that just sits there.  The other side of
the top floor has some sort of control panel behind a metal screen
that I can't open; to the right of the control panel is a switch
that is accessible (outside the screen).

Outside this building are two other buildings, one with some
sort of electrical equipment that has zapped an ant-lion.  The
other one is where I got my grav gun; it was on a pressure plate,
and when I took the gun, I got pummelled by ant lions and barely
escaped with my life.  Behind this second building is a broken-
down truck with a couple of gas drums in it.

I've tried putting things on all the pressure plates to make them
rise, and tried taking things off to make them all drop, but I
can't get the 6 off the one plate.  I've flipped all the switches.
Oh, and I tried to make friends with the ant-lion queen; this was
a less-than-successful enterprise that left me seeing red.

Maybe there's some way up to the coppola of the big building, or
some other switch I've missed seeing... but I don't see any hints
of something hidden, and only see three switches.

Thanks again!

                           thomas.