Boreholes more than 5,000 metres deep were used to construct models of the subterranean ecosystem

10,668m

Cruising altitude

of commercial jets

8,848m

Mt Everest

830m

Burj Khalifa

3,700m

The subterranean biosphere extends at least 5,000m below ground

Average

ocean depth

Guardian graphic

Boreholes more than 5,000 metres deep were used to construct models of the subterranean ecosystem

10,668m

Cruising altitude

of commercial jets

8,848m

Mt Everest

1,345m

830m

Ben Nevis

Burj Khalifa

3,700m

The subterranean biosphere extends at least 5,000m below ground

Average

ocean depth

Guardian graphic