satch, here is what there is in Coehlo Buda's WT:
"Go behind the waterfalls, and it should be very dark. Go as far left as you
can without entering a small tunnel. Walk to the back wall of the cave and
turn around so that you are looking at the waterfall. You should be able to
see a silhouette of a machine. Move the cursor around the top-middle of the
machine and when it indicates you can click on something, do. This will turn
on the first steam light generator. On the right side of the cave you fill
find another one of these. Turn it on also".
"You will have to push both wooden stools, one at a time, to the area behind
the waterfall to the right, more precisely, to the place you jumped with the
fireflies to enter the cave. Push both against the wall so that they form a
bridge. They should be side by side with one flat hexagonal top to the wall
and the other turned to you. Test them to make sure you will not fall into the
water when trying to cross them".
In the first cave you enter, the one near the smallriver, there are 2 steam generators.
The bridge to build with the traps are to be build where you first enter the cave.
You need the bridge because you can't get wet when carrying the fireflies.