280 — The Hunter-Killer

Britain's entire fleet of hunter-killer submarines is currently unavailable. All of them. The Royal Navy's complete attack submarine fleet is in maintenance, which means zero hunter-killer submarines are available to hunt or kill anything. The Defence Secretary confirmed this in parliament.
The submarines are called hunter-killers. This is not a nickname — it is the official designation for the vessel class. The Royal Navy named them for the two things they do. They currently cannot do either.
John Healey, the Defence Secretary, described the situation as a maintenance challenge. He did not describe it as a naming problem, which it also is. A fleet of hunter-killers that cannot hunt or kill is, at minimum, a partial description. A fleet of maintenance-in-progressers that cannot hunt or kill is more accurate, but it does not appear on the vessels' official designation.
Hunter-killer submarines were developed to track and destroy enemy submarines and surface ships. They are, by design, the apex predators of naval warfare. The Royal Navy has a full complement of them. The full complement is currently docked. The oceans are operating as normal.
The parliamentary answer did not specify how long the maintenance window would last. It also did not specify what, during the maintenance window, was supposed to be hunted or killed if the need arose. These may be questions for a different parliamentary session.
The submarines will return to service. When they do, they will once again be capable of hunting and killing. This will restore the accuracy of their designation, which has been temporarily suspended alongside their availability. The seas will continue to be there in the meantime.
Britain has not announced a replacement name for the vessels during the maintenance period. Hunter-killer-pending-maintenance is presumably not under consideration.