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#7 |
Subsim Aviator
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Americans had a thermalgraph (at least i think thats the name) if im not mistaken, it would measure the outside water temperature and when there was a sudden and rapid change in temperature they knew they were passing a thermal layer.
German subs did not have this. the only way they were able to assume they had passed a thermal layer was if the enemy continued to attack a much shallower position or the wrong position entirely.
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