 One of which (the eastern one) had a roof put on it and was turned into a gymnasium for the high school and was opened in 1987.The tank had its official opening on 9 September 1987, but was well in use both by the school and the community from the day the workmen finished in 1987.The new-look tank was a gymnasium for the school, but because it was now the biggest indoor venue in Darwin, it quickly became popular for all kinds of social occasions such as gala balls.