In The Matrix Morpheus says:
When the Matrix was first built, there was a man born inside who had the ability to change whatever he wanted, to remake the Matrix as he saw fit. It was he who freed the first of us, taught us the truth.
But as we see from when Neo was freed, if the humans who saved him hadn't been there, he would have simply drowned in the sewers below. So how come those who were first freed didn't drown? Were humans alive outside of the Matrix who saved them from drowning when they were freed? Or how did they survive?