Surveillance services;
closed circuit television surveillance;
sewer flow surveillance namely, monitoring flow levels within sewers for safety levels, leaks and blockages performed by drain cleaners and engineers;
inspection of boreholes, shafts, wells, ducts, water mains, cooling water intakers, archeological structures, bridge columns and soffits, mine working, piles flues, chimneys, oil lines, gas mains, waste chutes, industrial pipelines, sea outfalls, chemical tanks