The C-Class Submarine refers to a series of submarines built by the Royal Navy during the early 20th century, specifically in the 1900s. These submarines were designed for coastal defense and were among the first to be used in combat during World War I. C-Class submarines were typically around 200 feet long and could carry a crew of about 30 men. They were equipped with torpedoes and had a limited range, making them suitable for patrolling near shorelines. Their design laid the groundwork for future submarine developments in naval warfare.