Assertion: black hole | /r/CapableOf | measure 4.30 × 5.50 ⁠metres
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text: The Black Hole of Calcutta was a dungeon in Fort William, Calcutta measuring 4.30 × 5.50 ⁠metres (14 × 18 ⁠⁠feet), in which troops of Siraj ud-Daulah, the Nawab of Bengal, held British prisoners of war the night of 20 June 1756.