These particular Cenotes are now protected by the Mayans, who still believe they are apertures to the underworld.

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The boxes were broken open for any mail to be retrieved, then metal plates were placed in the apertures, she said.

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Exceptional resolving power and contrast at all apertures are teamed with smooth, quiet autofocusing and a rear-focus system that maintains the same lens body length during AF.

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Because the new salt is lighter and finer than the old salt and tends to blow around, Schroeder said, shouting over the din, the engineers were in the process of changing the size of the apertures in the salt receptacles to insure a more even flow.

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