The Royal Navy is taking parts from one of its aircraft carriers and using them on its other one.
New warships often have problems, especially complicated vessels like aircraft carriers.
HMS Prince of Wales, which was commissioned in 2019, has been sidelined since August because of a broken propeller shaft.
HMS Queen Elizabeth and HMS Prince of Wales sail together for the first time in May 2021.
(HMS Queen Elizabeth's escorts during its maiden deployment included a US Navy destroyer and a Dutch navy frigate.)