If the chick pips through the egg and then it is surrounded by the excess fluid, it is like holding it's beak under water. Seriously, if you ever see it happen, it will be perfectly clear.
I have managed to save some, by frequent checking, but some I have not got to in time and you can see where fluid has poured down the side of the egg, below the pip. After opening the egg you can see how wet it was inside.
I've hatched 300+ chicks this spring, and lost maybe 10 this way. And those have been recently, since outdoor humidity has increased. I just need to be more vigilant in controlling my humidity.