AUS-ROV R&D developed a remotely operated vehicle vacuum cleaning system for water tanks which allows tanks to be kept online whilst sediment is being removed. The system incorporates a custom made vacuum suction head fitted to the Seabotix LBV200 ROV. The tank floor is remote control cleaned using this system which saves water, eliminates confined space entry, and only requires two personnel to carry out the operation. Thickness testing of a steel water tank's floor and shell can then be achieved by ROV UT Instrumentation.