<P> From 1834 to 1849, when the first migrations of indentured laborers began, no fixed depot had been established to accommodate the immigrants arriving in Port Louis . The thousands of migrants arriving annually put a stress on the lack of a specialized facility . In 1849, a building dating back to the French administration in the Trou Fanfaron area was chosen as the core of a planned structural complex that would become the permanent depot for immigration . The Immigration Depot, as it came to be known, was continuously enlarged in response to the high number of migrants . This lasted until 1857, when all the available land had been occupied . The adequate space allowed the facility to deal with as much as 1,000 prospective laborers at any one time . Further modifications, for the purpose of service convenience, hygiene and transport, were continuously done . However, the competition from beet sugar caught up with Mauritius's sugar cane estates . The spread of a malaria epidemic in the 1860s further drove shipping away from the colony, leading to a decline of indentured immigration, culminating in 1923, when it had completely ceased . By then, an estimated 450,000 indentured laborers from India had passed through the Immigration Depot throughout its existence . </P> <P> The end of indentured immigration meant that the Immigration Depot had served its purpose . After 1923, the buildings were put to other uses . The structures remained extant until the 1970s, when the construction of a bus station and a corresponding motorway led to the demolition of some of the buildings . </P> <P> A renewed interest on the site's importance in the 1980s was sparked by the visit to the site by the late Indian Prime Minister Indira Gandhi in 1970 . This led to the protection of the complex's remains as a national monument in 1987, through the national heritage legislation . A landscape project over a part of the site and a series of restoration works were initiated in the 1990s . The lack of a formal conservation plan or a methodical archaeological approach have call into question the site's historic authenticity . 2001 was a landmark year for the site . The Aapravasi Ghat Trust Fund was established to manage the site directly . Its responsibilities include overseeing the excavations and implementing corrective actions on restorations that were haphazardly done since the 1990s . Among the previous preservation works that are being reversed are the landscape project, the hospital building's roof installation, which unfortunately used modern materials, the use of native lime mortar technique in the reconstruction and maintenance of the remaining stone walls, and devising an archaeological strategy to document finds and discoveries, as well as to safeguard the existing artifacts . The objective of the conservation efforts is for the site to regain its appearance in the 1860s . The site's name was officially changed to Aapravasi Ghat that same year . The name change was not without controversy . Although it was meant to reflect the Hindu Indian majority of indentured laborers, the use of the Hindi translation swept away the myriad of other ethnic and religious populations that also passed through the Immigration Depot . </P> <P> The uncontrolled urban development after the abolition of the indentured system and the late initiative to conserve the site in late 20th century meant that only the partial remains of the place have survived . From the complex founded in 1849, experts estimate that only about 15% still authentically exists today . However, records of the building plan and photographs, as well as recent archaeological evidence, allow for the precise reconstruction of the complex . </P>

Which of the following was a location for immigration depots