M3 was originally to be scrapped in 1933, but the date was brought forward after the unfavourable reports of her abilities as a minelayer, and she was sold out of service on 6 February 1932, and was scrapped at Newport in April 1932. Experience gained from the converted M3 was used in the design of the Porpoise-class minelaying submarines, which carried their mines in a single row. Other ships The monitor was also known by the name HMS M3 for a short time. References External links British M-class submarines Ships built on the River Tyne 1918 ships World War I submarines of the United Kingdom Ships built by Armstrong Whitworth Minelayers of the Royal Navy