A Russian village was left baffled after its residents woke up on Friday to discover their lake had disappeared.

NTV television showed pictures of a giant muddy hole bathed in summer sun, while fishermen from the village of Bolotnikovo looked on disconsolately.

"It is very dangerous. If a person had been in this disaster, he would have had almost no chance of survival. The trees flew downwards, under the ground," said Dmitry Zaitsev, a local Emergencies Ministry official interviewed by the channel.

Officials in Nizhegorodskaya region, on the Volga river east of Moscow, said water in the lake might have been sucked down into an underground water-course or cave system, but some villagers had more sinister explanations.

"I am thinking, well, America has finally got to us," said one old woman, as she sat on the ground outside her house.