People got more innovative with technology, using hidden devices such as pinholes and pen cameras.
Thousands of centrifuges are needed and the engineering is tricky, but the process is more easily hidden, with reasonable electrical requirements and no heat or gas that can be detected by sensors.
One ship, they explain, can bring in more weapons than a fleet of lorries with hidden military hardware.
It is relatively easy to ask the hapless representatives of companies such as G4S whether they agree with criticism of their record: finding the hidden truth is more difficult.
The threat of your house being robbed and criminals being able to find your hidden bills or walk away with your safe is much more likely than losing money due to cyber crime.
Still, some industry analysts question whether some newcomers to student housing understand the hidden risks and high costs associated with the business, which requires more maintenance and management oversight than typical apartment housing.
Desserts were also found to be a surprising source of hidden salt, Cash said, with five found to contain the same or more salt as a packet of crisps.
For defined contribution plans (where participants choose among investments), plan sponsors should more carefully scrutinize the intermediaries and managers they entrust with assets, especially now that so many hidden financial arrangements between these parties have surfaced.
Relationships with colleagues and giving back to the community are more important to women than salary, according to "The Hidden Brain Drain: Off-Ramps and On-Ramps in Women's Careers, " a study by the Center for Work-Life Policy, which was published in the Harvard Business Review last year.
This range is the size of the European Alps with the tallest peaks reaching 3, 000m above sea-level - and yet they are still hidden below more than a 1, 000m of ice.
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