II. The two lines of twelve arches to the west of this tablet are all that now remains above ground of old Fort William and originally formed a portion of the arcade within the South Curtain. The Black Hole Prison was a small room formed by bricking up two arches of a similar but smaller arcade within the East Curtain south of the East Gate. The sunken arches, where the Post Office vans were kept, once formed part of the arcade within the south curtain, the wall line of which is marked out by brass lines let into the pavement. The wall of the curtain, a portion of which was still standing in 1895, backed the old export and import warehouses, and through the arches one would have in the old days looked into the parade ground within the Fort. The export and import warehouses were built against the south curtain in 1741 and would have followed the line of Koila Ghat Street. The angle of the south-east bastion and the thickness of its walls is indicated by brass lines let into the steps of the Post Office. A tablet pointing out this fact is on the adjacent wall, and the entrance to the east gate of the Fort is commemorated by a tablet fixed into the red building opposite the Holwell obelisk: Sixteen feet behind this wall was the entrance of the East Gate of old Fort William through which the bodies of those who perished in the Black Hole were brought and thrown into the ditch of the Ravelin on 21st June, 1756. To the north of the General Post Office building, inside the large gateway, is a tablet with the following inscription:-- THE BLACK HOLE. The marble pavement below this spot was placed here by Lord Curzon, Viceroy and Governor-General of India, in 1901 To mark the site of the prison in Old Fort William known as the Black Hole. In which 146 British Inhabitants of Calcutta were confined on the night of the 20th June, 1756, and from which only 23 came out alive. The pavement marks the exact breadth of the prison, 14 ft. 10 in., but not its full length, 18 feet. About one-third of the area at the north end being covered by the building on which this tablet is erected. Near by Mr. Holwell, then Collector of Calcutta, who was one of the survivors, erected an obelisk at his own expense to the memory of those who perished in the Black Hole on the spot where the 123 killed were buried. The tablet bore the following inscriptions:-- To the Memory of--