to the port location of Tranquility was required because NASA decided to leave the Multi-Purpose Logistics Module (MPLM) Leonardo permanently attached to the ISS, which will be located at the nadir side of Unity. In 2001, NASA considered changing the design of the module. This idea for an extended or "stretched" module, was a result of the deferral/deletion of the Habitation Module. The stretched module would have held 16 racks, compared with the baseline capacity of eight racks. This modification was not funded and the plans were abandoned. Purpose The module's life-support system (ECLSS) recycles waste water for crew use and generates oxygen for the crew to breathe. In addition, Tranquility contains an atmosphere revitalization system to remove contaminants from the atmosphere and monitor/control the atmosphere constituents of the ISS. Tranquility also contains a Waste and Hygiene Compartment (toilet) for supporting the on-board crew. Tranquility is primarily used for exercise, storage, and robotics work in connection with Cupola. Launch, berthing, and connections to other station components Tranquility was located in the clean room at the Thales Alenia Space, Turin site until 2009. It was shipped to Kennedy Space Center (KSC) on 17 May 2009 and arrived in Florida on 20 May 2009. It was officially welcomed to KSC on 8 June 2009. Tranquility was launched on 8 February 2010 on board the STS-130 mission flown by Endeavour. It was berthed to the port side of Unity on 12 February 2010. To accommodate the SpaceX Dragon V2 and Boeing Starliner Commercial Crew transports expected to be operational by 2017, ISS crews began work in March 2015 to configure the station. As part of this work, Pressurized Mating Adapter-3 on the port side of Tranquility will be moved to the zenith port of the Harmony module, above Pressurized Mating Adapter-2, to serve as a backup docking port for these vehicles. In addition, on 27 May 2015 the Leonardo Permanent Multipurpose Module was moved from the nadir of Unity, to the forward port side of Tranquility to free up Unity as a backup port for Commercial Resupply Services cargo spacecraft from SpaceX and Orbital Sciences. In April 2016, as part of the cargo payload from SpaceX CRS-8, the Bigelow Expandable Activity Module (BEAM) was attached to Tranquility on its aft port for a two-year duration. Port PMA-3, 2010–2017 Nanoracks Bishop Airlock, 2020–present Starboard Unity, 2010–present Forward Leonardo, 2015–present Aft Bigelow Expandable Activity Module