"Some experts have suggested highly toxic rocket fuel could have leaked into the sea. The first test site, Radygino, is about six miles (10km) from the sea and was used for drills in August.
Vladimir Burkanov, a biologist specialising in seals, in a comment published by the Novaya Gazeta opposition newspaper, suggested old stores of rocket fuel kept in Radygino could have rusted and the fuel leaked into streams.
The other site, Kozelsky, has been used to bury toxic chemicals and pesticides, according to the governor’s website."
"Some experts have suggested highly toxic rocket fuel could have leaked into the sea. The first test site, Radygino, is about six miles (10km) from the sea and was used for drills in August.
Vladimir Burkanov, a biologist specialising in seals, in a comment published by the Novaya Gazeta opposition newspaper, suggested old stores of rocket fuel kept in Radygino could have rusted and the fuel leaked into streams.
The other site, Kozelsky, has been used to bury toxic chemicals and pesticides, according to the governor’s website."
https://www.theguardian.com/world/2020/oct/05/marine-poisoning-in-kamchatka-russia-may-be-rocket-fuel-leak