A significant portion of Nauru's income has been in the form of aid from Australia. In 2001, the MV ''Tampa'', a Norwegian ship that had rescued 438 refugees from a stranded 20-metre-long boat, was seeking to dock in Australia. In what became known as the ''Tampa'' affair, the ship was refused entry and boarded by Australian troops. The refugees were eventually loaded onto Royal Australian Navy vessel HMAS ''Manoora'' and taken to Nauru to be held in detention facilities which later became part of the Howard government's Pacific Solution. Nauru operated two detention centres known as State House and Topside for these refugees in exchange for Australian aid. By November 2005, only two refugees, Mohammed Sagar and Muhammad Faisal remained on Nauru from those first sent there in 2001, with Sagar finally resettling in early 2007. The Australian government sent further groups of asylum-seekers to Nauru in late 2006 and early 2007. The refugee centre was closed in 2008, but, following the Australian government's re-adoption of the Pacific Solution in August 2012, it has re-opened it. The US Atmospheric Radiation Measurement program operates a climate-monitoring facility on the island.