• 4 diesel engines 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 Thomson.

It is currently serving in the Submarine Force with a base port in Talcahuano.

Between 2009 and 2012, it underwent a systems modernisation.