The S-class submarine is a type of submarine used primarily by the Royal Navy during World War II. Designed for coastal and anti-submarine warfare, these vessels were known for their relatively small size and agility. They typically displaced around 1,000 tons and could carry a crew of about 40 men. Equipped with torpedoes and deck guns, S-class submarines played a crucial role in disrupting enemy shipping and gathering intelligence. Their design allowed for effective operations in shallow waters, making them valuable assets in the Battle of the Atlantic and other naval engagements during the war.