And even back on the south coast, hidden behind the heat and horn-honking of Colombo, Sri Lanka's capital, you will also find a trove of architectural treasures, many legacies of the country's melting-pot religious heritage.
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.
She fretted over any imperfection in her skin, like a mosquito bite or a heat rash or a tiny pimple, and often wore a hidden Band-Aid on a shoulder or calf, holding some ointment in place.