"In December 2005, Brazil commissioned the submarine Tikuna (S 34) into service. The submarine a German Type 209 variant, is the fifth and final boat of this class to enter service with the Brazilian fleet. Construction of the submarine took a decade to complete because of numerous delays and a two-year work stoppage. The delays, however, contributed to numerous improvements, including a lengthened hull that allows a more powerful propulsion system and improved endurance, automatic depth control, reduced radiated noise, a freshwater distilling system, a new weapons control system, improved air conditioning systems as well as fittings to accept a submarine rescue submersible and the ability to put two people at a time into the rescue lock-out chamber. The lead submarine of the class Tupi (S 30) was built in Keil, Germany at Howaldtstwerke Deutsche Werft (HDW) Shipyard."