How many breathers in total?

I'm puzzled by the number of breathers I have. I have been doing some research on what is really needed for off-roading, and I have cane across a number of people saying that the diff breathers need raising if your going in any water above the hight of the diff.
So my question is this, how many breathers are fitted to a 53 TD4 manual? And where are they located.

There's one on the rear diff, follow the pipe. One on the IRD, which can be seen if looking at the steering coloum, in engine bay. Someone else will have to do the rest as mines not a diesel, but I would expect the gearbox has one.

Be careful of water. Also contains dirt, mud and little bits that like to destroy bearings and oil seals. From experience, I keep away from it if I can. Not because the doors are said to fall orf.

Cheers mate. I don't really intend on driving through much, if I can help it, but I want to make sure that if I can't help it I have done as much as I can to prevent damage.