The K-Class submarines were a series of British submarines built during World War I. Designed for surface warfare, they were unique for their ability to operate both underwater and on the surface. The K-Class featured a distinctive design with a long hull and were equipped with powerful engines, allowing them to travel at high speeds. These submarines were intended to engage enemy ships and support naval operations. However, their performance was often criticized due to issues with stability and reliability. Despite their innovative design, the K-Class submarines had limited success in combat and were eventually retired from service.