Comet ISON was discovered by Russian astronomers Vitali Nevski and Artyom Novichonok in September 2012.

CNN: Stargazers capture images of comet

Rumor has it that someone has uncovered a sole surviving Dark One, and Artyom is now on a quest to find it.

FORBES: PAX East Impressions: Metro: Last Light

The comet, discovered by Vitali Nevski and Artyom Novichonok and named for their institution, the International Scientific Optical Network, is still distant: 793 million kilometres away.

BBC: Comet Ison caught on film by Deep Impact craft

Mr Lebedev's spokesman, Artyom Artyomov said the decision was "absolute nonsense and completely impossible to implement", and that he would continue to campaign as normal while he appealed.

BBC: Lebedev barred from Sochi contest

At one point, Artyom delivers a shotgun blast to a mutant at point-blank range, and a burst of tinnitus blanks out the sound of the world for a few moments.

FORBES: Hands-off Preview - Metro: Last Light

The moments where Artyom has to fend off a monster that has pinned him to the ground, or pluck a mutant spider from the glass of his gasmask, are satisfyingly visceral.

FORBES: Hands-off Preview - Metro: Last Light