Tunguska event was huge but left no crater

The Tunguska event caused a massive explosion in 1908.

The event happened in 1908 over remote Central Siberia.

Aerial view of a settlement on the Podkamennaya Tunguska River.

Dense taiga forest near the Podkamennaya Tunguska River.

A tree root from the 1908 Tunguska explosion.

Eyewitnesses saw a fireball brighter than the Sun.

Snow-covered taiga with dark patches near Tunguska site.

The event is the most violent impact recorded in modern times.

Scientists still debate if the object was comet or asteroid.

It remains the most violent impact recorded in modern times.