Penetrate" in this sentence means "pass through" as in "pass through a barrier", as the suit created a barrier through which no water could pass. It also has the meaning of "enter through an orifice", as there were no holes in the suit through which the water could enter.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.