NEW : Workers removed concrete blocks before demolition . The cannon was carried aboard the British ship HMS Hussar . Authorities remove about 20 tons of gunpowder and dispose of it at a gun range . Author : ` ` It was there for so many years , and people were sitting on it ''
NEW : Workers removed concrete plug before discovery . The cannon fired munitions aboard the British warship HMS Hussar . Authorities remove about 1.8 pounds of gunpowder and dispose of it at a gun range . Author : `` It was there for so many years , and people were sitting on it ''