Sea Dogs was invited to find the solution and get this 1.1 km long pipe cleaned. We responded by developing an RoV which could operate under water. The RoV had brushes forward and aft which could be raised or lowered and rotated. Water jets were also provided to disperse the sand using water pressure. Once the water jets and brushes made the slurry, submersible pump was provided to discharge the slurry aft of the RoV. The sand collected in the manhole. The slurry was removed from the manhole and discharged back into the sea using pumps. A pipeline profiling sonar was used to get the picture inside the pipeline as the cameras were ineffective. A platform was lowered into the manhole with its surface flush with the pipeline. The machine was lowered into the manhole and placed on the platform and aligned with the pipeline. Thereafter, all operations (moving forward or aft, raising or lowering of brushes, rotating the brushes, operating the water jets, operating the pipeline profiling sonar) were done remotely.