On December 4, DMI showed Arctic sea ice volume above the 2004-2013 average.
I tweeted about this and copied BBC News, CNN, NPR and the New York Times.
Quite predictably, the data disappeared for three days, and now that it has returned, DMI has massively reduced the amount of sea ice in the Arctic. Much of the thick ice off the coast of Siberia has disappeared.
Presumably their data tampering has freed the Russian ships trapped in the ice.