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They can submerge, remain submerged and resurface. They are water-tight so that when submerged they do not fill up with water and so lose their buoyancy. Also they have buoyancy tanks into which water is allowed to enter and so increase the mass of the submersible. This makes it submerge. But that water can be pumped out to increase the buoyancy when the submersible wishes to return to the surface.

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10y ago
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Q: What can submersibles do that regular ships can't and why?
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