Odilon Salima takes a deep breath before diving into the depths of the Ubangi River in search of a precious commodity in the Central African Republic: sand. Many "sand fishermen" like him put their lives and health at risk to get the sand for the construction sector. "Our health is usually the least of our worries, because between our low income and our household expenses, there's almost nothing left," says Salima. IMAGES AND SOUNDBITES