This photograph was taken during an air-raid drill in the slit trenches. Two black and white photos of Ballarat School of Mines slit trenches in the grounds of the Ballarat School of Mines. Students of the Ballarat Junior Technical School are in the zig zag trenches. Many students wear their school blazers, hats and school bags. Sandbags surround the trenches which were situated near Albert Street, Ballarat.ballarat school of mines, ballarat junior technical school, world war, world war 2, air raid shelter, education, school, emergency shelter, world war two, class