"Simpson" (SS-21) is a Type 209 submarine, 1400-l variant and referred to as the Thomson class. The boat was built for the Chilean Navy by Howaldtswerke-Deutsche Werft shipyards in Kiel, Germany.
"Simpson" is the first of two units, ahead of . It is currently serving in the Submarine Force with a base port in Talcahuano. Between 2009 and 2012, it underwent a systems modernisation.
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