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The Philae lander has attempted to drill into the surface of comet 67/P, amid fears that its battery may die in hours.

Researchers at Esa say the instrument is being deployed to its maximum extent despite the risk of toppling the lander.

Scientists hope they will also be able to capture some samples for analysis in the robot's onboard laboratories.

If the battery dies the results may not make it back to Earth.

SciShow takes you down the deepest hole in the world -- Russia's Kola Superdeep Borehole -- explaining who dug it and why, and what we learned about Earth in the process. Don't fall!