If it had hit Central London, Britain would no longer have a capital city. The force of the meteorite that hit eastern Siberia last September destroyed 40 square miles of forest and caused earth tremors felt 60 miles away.

An expedition from Russia's Kosmopoisk institute has only recently reached the site in a remote area north of Lake Baikal because of bad weather and difficult terrain, the Interfax news agency said yesterday.

Fragments of the meteorite had apparently exploded into shrapnel 18 miles above the Earth with the force of at least 200 tonnes of TNT.

At the time, Russian media reported that villagers 60 miles away had witnessed a gigantic fireball screeching down from the sky, causing windows to rattle and house lights to swing as they were hit by blast waves on September 25. There were no reported casualties.