The helicopter from a Chinese icebreaker has arrived to help evacuate passengers and crew from the stranded Akademik Shokalskiy ship.
Professor Chris Turney posted footage of the helicopter arriving on the group's YouTube account.
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The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.