A polar bear known as the “saddest bear in the world” has passed away following “blood circulation imbalances” causing a great decline in his health.

Arturo died in Mendoza Zoo, Argentina after failed attempts to move him into better conditions by environmental campaigners Greenpeace.

He was given his nickname after becoming depressed because his long term mate, Pelusa, died of cancer in 2012.

Arturo was the last captive bear in Argentina after being transferred there from the US at the age of eight.

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The depressed bear was in conditions that were deemed as “inappropriate” by Greenpeace.

His enclosure was cramped along with the scalding temperatures that are completely unfit for an arctic creature; there was only a 20 inch deep pool for the struggling bear to cool off in.

Greenpeace, along with celebrities like Cher, started a campaign in 2014 to get Arturo transferred from Mendoza Zoo to Assiniboine Park Zoo in Winnipeg, Canada.

The petition gathered around 700,000 signatures; sadly that became an effort in vain as veterinarians said that Arturo wouldn’t survive the journey due to his old age.

However, Mendoza Zoo aren’t strangers to controversy after they closed their doors following the death of 64 animals between December 2015 and May 2016 .

According to zoo officials, outbreaks of bacteria and overcrowding were the main factors of this catastrophe.

Authorities are going to change the zoo into an ecological park and send the animals to much more suitable destinations.

“We hope that he will be the last polar bear to be held in a zoo in our country,” said Soledad Sede, Greenpeace spokeswoman.