types of heritage. we are seeing some pictures of types of heritage. we are seeing some pictures of some - types of heritage. we are seeing some pictures of some of- types of heritage. we are seeing some pictures of some of those | types of heritage. we are seeing l some pictures of some of those on the list. tell us about the submarine? it the list. tell us about the submarine? the list. tell us about the submarine? it is a d class submarine, submarine? it is a d class submarine, served i submarine? it is a d class submarine, served in i submarine? it is a d class submarine, served in the| submarine? it is a d class i submarine, served in the first submarine? it is a d class submarine, served in the first world wan submarine, served in the first world wan built submarine, served in the first world wan built in submarine, served in the first world war. built in 1909. it was sunk as a piece war. built in 1909. it was sunk as a piece of war. built in 1909. it was sunk as a