Radioactive Releases from Sunken Submarine in Norwegian Sea
K-278 Komsomolets sank in Norwegian Sea on April 7, 1989.
Wreck monitored since 1990s with manned submersibles.
2019 ROV survey found strontium, cesium, uranium, and plutonium in samples.
Strontium and cesium levels near hull were 400,000 and 800,000 times normal.
Torpedo compartment remains sealed with titanium plugs since 1994.
No weapons-grade plutonium leakage detected in sediment.
Radioactive contamination and sediment levels drop sharply near wreck.
Sponges, corals, and anemones show slight cesium elevation with no deformities.
Researchers urge continued monitoring of corrosion and contamination.
2 weeks ago