Soviet scientists drilled 12 kilometres into the Earth, but the world's deepest borehole barely scratched the planet's crust

In 1970, Soviet scientists began drilling into the ground on the Kola Peninsula in the far northwest of the country, hoping ...

Lake Baikal in Siberia: The deepest lake on Earth holds 20% of the world's unfrozen freshwater and is 25 million years old

Standing beside a large lake, it is easy to assume that its most impressive feature is its surface area. Yet some lakes hold ...
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Scientists discover world's deepest underwater sinkhole: 'Its bottom [is] still not reached'

The world's deepest underwater sinkhole in the waters of Chetumal Bay between Mexico and Belize remains shrouded in mystery after researchers reported they have yet to determine its full depth.