How do honeybees requeen themselves?
Thanks to @S-Pr I found the answer on wikipedia. On the Supersedure section of the article it is written the following:
If a queen suddenly dies, the workers will attempt to create an &quot;emergency queen&quot; by selecting several brood cells where a larva has just emerged which are then flooded with royal jelly. The worker bees then build larger queen cells over the normal-sized worker cells which protrude vertically from the face of the brood comb. Emergency queens are usually smaller and less prolific than normal queens.
Although, There is no reference to a source. Maybe one of the citations at the end of the page has the answer.