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It is mechanically sealed. Cell phones are starting to use this same technique.
It is not so much a secret as it is simply not that amazing.
A device that directs a very high frequency mechanically bonds to similar materials at the molecular level, sometimes they use heat. It can be stronger than the object itself in some cases. The secret for them is probably the way they apply the heat or agitator to such a large object, which is impressive. But the odds are it is will done the same way, just bigger.
Just search on mechanically bonded or hermetically sealed and you will find lots of articles on it.
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