It's not just Covent Garden with casting crises.
When Juha Uusitalo became too ill to sing tonight's The Flying Dutchman beyond the first act, conductor Vasily Petrenko had a major problem on his hands.
The good news - there was another bass in Oslo who knew the title role by heart. And the bad - he was already on stage, as Daland.
There was only one solution. Russian superbass Stanislav Shvets took on both parts for the last two acts. Luckily for all concerned it was a concert performance.