Inside the deadly Russian Arctic prison where Alexey Navalny spent his last days

• Deceased Russian dissident Alexey Navalny spent his final days in one of Russia's harshest prisons.
• Located near the Arctic Circle, the IK-3 prison colony is infamous for its terrible conditions.
• One analyst said Russia's penal colonies were known for their austerity and dispiriting atmosphere.

Russian opposition politician Alexey Navalny, 47, spent his final days in one of the country's harshest prisons.