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Originally Posted by Patboot
edit- on diving, the sub simply opens vents at the top of the ballast tank- there might be some bubbling, but its very localised- watch your wake as you go under.
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Yup. Also the diving cells are open to the sea at the bottom, they are not fully enclosed tanks (in case anyone didn't know this). The pressurised air inside the cells stop seawater from filling them. On diving the vents on top of the diving cells were opened, allowing the air to escape from the top and seawater to enter from the bottom.