A Russian scientist is claiming that aliens downed Tunguska meteorite in 1908, causing a massive explosion in Siberia to protect the earth from destruction.

Dr. Yuriy Lavbin, president of the Tunguska Spatial Phenomenon Foundation, insists that if an alien spacecraft had failed to place itself between our planet and the gigantic meteorite a century ago, the full force of collision above Siberia would have been disastrous.

He provided 10 recovered quartz crystals collected from the crash site as proof. Several of the crystals have holes in between, so they can be united in a chain.

"We don't have any technologies that can print such kind of drawings on crystals," Labvin told the Macedonian International News Agency.

"We also found ferrum silicate that can not be produced anywhere, except in space," added the scientist.

Labvin thinks the marked quartz slabs are remnants of an alien control panel, which fell to the ground after the UFO slammed into the giant rock.

The findings add a new original theory to what most scientists have explained over the years as a meteorite exploding several miles above the surface of the earth.

During the Tunguska event, a massive explosion estimated at 15 megatons spread over 2,150 square kilometers (830 square miles) downing nearly 80 million trees. The impact left no casualties in the sparsely populated area.

Some scientists believed the Tunguska event is the largest impact event on land in the Earth's recent history.