. "HMS D1"@en . . . "* HMS D3\n* HMS D7"@en . "* HMS D2\n* HMS D6"@en . . . "The D class submarine was the Royal Navy's first class of submarines capable of operating significantly beyond coastal waters. They were also the first boats to be fitted with wireless transmitters. All ten were laid down between 1907 and 1910."@en . "3.25"^^ . "The D class submarine was the Royal Navy's first class of submarines capable of operating significantly beyond coastal waters. They were also the first boats to be fitted with wireless transmitters. All ten were laid down between 1907 and 1910."@en . . . "8.5"^^ . . . "British D-class submarine"@en . . "white"@en . . "300"^^ . . "* HMS D4\n* HMS D8"@en . . . . "* HMS D1\n* HMS D5"@en .