The "Challenger-class" refers to a series of submarines used by the Royal Navy of the United Kingdom. These submarines are designed for various roles, including anti-submarine warfare, intelligence gathering, and special operations. They are known for their advanced technology and stealth capabilities, making them effective in modern naval warfare. The first submarine of the Challenger-class, HMS Challenger, was commissioned in the early 1970s. The class features a distinctive hull design that enhances underwater performance and maneuverability. Over the years, the Challenger-class has been succeeded by newer classes, but it remains an important part of naval history.