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The octopuses that went back for their air
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- Take away the air. What happens?
Researchers removed shell air from three female argonauts—octopuses with delicate, open shells.
- All three went back to the surface
They captured surface air in the shell and held it there with their arms before diving again.
- A pocket of air that helps it hover
As they dived, the trapped air compressed. At depth, its buoyancy balanced their weight in the water.
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