A B-Class Submarine refers to a type of submarine developed by the Royal Navy during the early 20th century. These submarines were designed for coastal defense and were notable for their relatively small size and limited range. They typically featured a single hull and were equipped with torpedoes for offensive capabilities. The B-Class submarines were primarily used during World War I and played a role in patrolling and protecting British waters. Their design allowed for quick deployment and maneuverability, making them effective for their intended purpose. However, advancements in submarine technology soon rendered them less effective compared to newer models.