"To help prevent such lethal airborne contamination, Russian engineers have been gradually covering Lake Karachay with stones and concrete blocks, a controversial remediation method." ("Cold War, Hot Nukes: Legacy of an Era"Archived 2012년 5월 5일 - 웨이백 머신)
"To help prevent such lethal airborne contamination, Russian engineers have been gradually covering Lake Karachay with stones and concrete blocks, a controversial remediation method." ("Cold War, Hot Nukes: Legacy of an Era"Archived 2012년 5월 5일 - 웨이백 머신)