When satellites captured images of circles on Lake Baikal, the world's oldest and deepest lake, scientists were surprised. What phenomena could have created such precise geometric patterns? Catch full episodes of your favourite Quest shows on discovery+: https://bit.ly/3oAzuyz Subscribe ...

The search continues with new episodes of In Search Of Fridays at 10/9c! Some Ancient Astronaut Theorists believe alien life could be found deep within the earth's most mysterious caves in this clip from Season 9, "Forbidden Caves". #AncientAliens Subscribe for more from Ancient Aliens and other ...

Under the waters of Lake Baikal in 1982, 7 Russian divers are exploring the world deepest freshwater lake on a research mission, but 50 metres underwater, ... source