High Quality Content by WIKIPEDIA articles! HMS Calcutta was an 84-gun second-rate ship-of-the-line of the Royal Navy, built in teak to a draught by Sir Robert Seppings and launched on 14 March 1831 in Bombay. She was the only ship ever built to her draught. She carried her complement of smooth-bore, muzzle-loading guns on two gundecks. Her complement was 720 men (38 officers, 69 petty officers, 403 seamen, 60 boys and 150 marines).