Tonight we report on the dark side of the diamond industry. We show how one of the world's richest companies has been stripping one of the world's poorest nations of its main asset - diamonds from this mine. Namibia - a forgotten country long denied its independence. Here for 20 years, South Africa has ignored international law, occupied the land by force and refused to allow the formation of a democratic government. Behind the cover of a military occupation, Namibia has been robbed of its mineral wealth. Here a mining company has leased the world's largest diamond workings, taken £5 billion worth of gems and paid a rent of £130 per year. At the mouth of the Orange River, an accident of geology and the sands of time has laid down one of nature's rarest gifts to mankind - lonely beaches encrusted with the finest gem diamonds in the world. Released by volcanic activity inland, the diamonds were originally thrown into the Orange River, then over the centuries they were washed downstream and taken to the sea. Incoming tides put the finishing touches bringing the diamonds ashore.