Ministry of Defence undated handout photo of the MADFOX, un-crewed surface vessel, used to provide deception and intelligence, surveillance and reconnaissance (ISR). (Image: PA Media) Want Stoke-on-Trent news emailed to you direct from our journalists? Sign up to our newsletterInvalid EmailSomething went wrong, please try again later. Subscribe We use your sign-up to provide content in ways you've consented to and to improve our understanding of you. This may include adverts from us and 3rd parties based on our understanding. You can unsubscribe at any time.More info Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice Swarms of drones have been operated underwater, on the sea and in the air in a first for the UK armed forces.