Fancy a new climbing challenge? Hidden mountains, more than 100 times larger than Everest discovered under the Earth’s surface

Mt everest from tibet.

Two hidden mountains, more than 100 times larger than Mount Everest have been discovered deep underground.

The two ‘islands of rock’ each measure more than 620 miles / 998km tall, dwarfing anything found on Earth’s surface and making Mount Everest look like an anthill.