Investigators probe mystery of giant Siberian sinkhole

A giant sinkhole in remote Siberia has experts baffled - but a team has been sent to look into it (sorry).

A team of investigators has been despatched to a remote area of Siberia to investigate reports of a giant sinkhole.

Aerial footage of the sinkhole, apparently taken from a helicopter, has prompted media speculation as to its origins, with everything from a meteorite strike (possible) to an underground explosion caused by a gas buildup in the permafrost (probable) to a UFO landing (nope) being posited.