One system (submarine) has differential pressure, like a tire on a car.
The other system (titanic) has equal pressure on all sides, like a tire swing on a tree.
Going deep makes the pressure go up. In the closed system, this difference increases. It’s like adding weight to one side of a scale until it tips. The open system is like balancing a set of scales, so each time I add a weight to the left side, the same weight is added on the right and the difference never increases no matter how many weights I add.
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