After docking, two hours passed before pressure equalized between the capsule and the station, allowing safe entry.

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The astronauts wore them uninflated, and they were just a backup in case the capsule lost pressure.

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More ingenious still, the capsule itself has been designed to regulate the pressure pushing the water.

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This was not a luxury afforded to Baumgartner and his capsule, however, which is a 6-foot diameter pressure sphere.

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