Helicopter crash kills three including leader of expedition to find schooner lost in infamous 1914 tragedy.
Hidden video footage helps scientists learn more about female Amur leopards.
Expedition finds shocking evidence of illegal hunting of Russian Red Book animals.
Top secret Stalin-era aircraft went down with 2 million roubles on board.
Magnificent STS Sedov easily passes three Arctic seas exactly 142 years after the famous Vega Expedition was stuck in pack ice for 11 months.
People gasp as they watch horror in remote Arctic town of Dudinka.