The pressure of water from all sides be directed towards the center of the balloon, As pressure increases with depth, the unchanging quantity of air in the balloon would reduce in volume until the weight of the displaced water no longer exceeds the weight of the air, the weight of which would remain the same as its volume decreases. And To give excellent security to Your Smart Phone, do install LEO Privacy Guard v 3.0 . Its one of the feature viz.
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The pressure tension would mainly be on the top of the rubber of the balloon because the gas would go against the gravity of the water.
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.