I once built a great fortress (Called "Fortress") with a complex water control system that could be used to thwart
enemy attacks and provide water sources deep underground. However, I eventually became sick
of that fortress, abandoned it, and decided to go back there in adventure mode and flood it.
Along the way, I discovered several interesting facts about water physics. First of all, after I
flooded the very bottommost floor, I discovered that I could no longer go down the stairs to that floor!
I'm not quite sure if the water has to be a full 7 deep for this to happen, but I suppose it makes a bit of sense.
I also discovered while playing in the partially drained river that rivers do have a degree of current that
acts somewhat randomly on creatures. It makes it so that you cannot move into certain squares, and
moves you 1-6 squares every few turns. As such, sometimes it was hard to get to the stairs to get out.
I did, of course, try to climb out the sides of the river, but I could not, and eventually I concluded that
you can only do so if the water is 7 deep or 0-1 deep. Anywhere in the 2-6 range disables you from climbing
out.
On a even more boring note, higher swimming skill enables you to swim faster. Duh, you might say.
But that expert swimmer could walk on land at a speed of 1400 and swim at a speed of 1000. It might
be possible for legendary swimmer to swim faster than he could walk! However, lying down or sneaking have
the same effect of halving your speed regardless.
Unfortunately, I could not do further research with that character after I decided to stay on
one of the levels as it was filling with water. I quickly discovered that even expert swimmers can
not hold their breath forever.
Sorry for the long post, especially if you guys already knew all this stuff. Some conformation would
be nice.