The main tank was not ready in time for the first day of principal photography. Cameron delayed filming for a week and pushed the smaller tank's schedule forward, demanding that it be ready weeks ahead of schedule. Filming eventually began on August 15, 1988, but there were still problems. On the first day of shooting in the main water tank, it sprang a leak and of water a minute rushed out. The studio brought in dam-repair experts to seal it. In addition, enormous pipes with elbow fittings had been improperly installed. There was so much water pressure in them that the elbows blew off.