Russian authorities state that there is no current risk of explosion or radiation leaks.
This will cause the sub's oxygen supply to, eventually, run out. Under normal conditions, such a vessel would have roughly 100 days of breathable air. It has been reported that the Kursk was involved in a collision with another object. Adm. Kuroyedov, head of Russia's Navy, is quoted as saying, There are signs of a big and serious collision. No word yet as to what the Kursk ran into.