Sergiyev Posad, Russia - When Alexei Voronenkov's 70-year-old mother passed away, he paid to have her brain frozen and stored in the hope breakthroughs in science will one day be able to bring her back to life.
It is one of 71 brains and human cadavers - which Russian company KrioRus calls its "patients" - floating in liquid nitrogen in one of several metres-tall vats in a corrugated metal shed outside Moscow.
They are stored at -196 degrees Celsius (-320.8°F) with the aim of protecting them against deterioration, although there is currently no evidence science will be able to revive the dead.
"I did this because we were very close and I think it is the only chance for us to meet in the future," said Voronenkov who intends to undergo the procedure, known as cryonics, when he dies.
The head of the Russian Academy of Sciences's Pseudoscience Commission, Evgeny Alexandrov, described cryonics as "an exclusively commercial undertaking that does not have any scientific basis", in comments to the Izvestia newspaper.