My guess is They use it to view and it is most likely bullet proof.
But they would have to flood the area behind it otherwise the glass would crack underwater
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Gunther Prien
Merchant Ships sunk:30
War Ships Sunk:1 ( HMS Royal Oak)
9 Ships Damaged
Iron Cross
193,808 Tonnage
U-Boat Ace
1/16/08-3/7/41
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