Victory at Sea: Royal Navy Submarines & MTB sectionsSubmarines: Designed for use in North European and Mediterranean waters, the S class was manoeuvrable with a noted ability to crash dive extremely quickly. Combined with a large salvo of torpedoes, this was a successful design of pre war years that was soon updated and put back into production. MTBs: The Fairmile A was designed from the outset to use prefabricated components that could be produced by small businesses such as furniture manufacturers,