A small number of people around the globe are opting to have their brains or bodies frozen after death in a procedure known as cryonics, hoping to be revived once medical technology advances. The concept is unproven.
Chinese children's writer and science fiction editor Du Hong -- who oversaw the publication of The Three-Body Problem, which last month won the prestigious international Hugo Award -- died of cancer in May, reports and US company Alcor said.
They spent "a fair amount of time" discussing their equipment with Chinese Customs officials before being allowed into the country, it added.
"Two government officials observed the entire procedure, and then immediate cooldown with dry ice," it said.
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The company was told that authorities would allow Du's body to be shipped out of China but ran into delays, it said.
"Chinese government bureaucracy delayed the approval process," it said, adding: "Dry ice was added every two days while the paperwork was sorted out."
Arizona-based Alcor said Du was its 138th "patient".