"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"Arkiveret 5. maj 2012 hos Wayback Machine)
"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"Arkiveret 5. maj 2012 hos Wayback Machine)