In Iceland, a Netflix series relied on testing and color-coded armbands. In Australia, the entire cast and crew of a Stephen King adaptation quarantined together.

Baltasar Kormakur, the Icelandic director best known in the United States for “Everest” and “Contraband,” turned to a color-coded armband system to get his Netflix sci-fi series “Katla” back into production in Reykjavik after the coronavirus shut it down in mid-March.