Interfax news agency said the scientists, who belong to the Tunguska space phenomenon public state fund, said they found the remains of an extra-terrestrial device that allegedly crashed near the Tunguska river in Siberia in 1908.
They also claim to have discovered a 50 kg rock which they have sent to the Siberian city of Krasnoyarsk for analysis.
The Tunguska blast, in a desolate part of Siberia, remains one of the 20th century's biggest scientific mysteries.
On June 30, 1908, what was widely believed to be a meteorite exploded a few kilometres above the Tunguska river, in a blast that was felt hundreds of kilometres away and devastated over 2,000 square kilometres of Siberian forest.
But the exact nature of the body that exploded and its origin remain a mystery which has spurred countless theories and controversies.