The project was a steel mill (SULB) being built in Hidd by Samsung Engineering. One of the storage tanks that was holding sludge had a leak at the bottom ,mainly from the pipes joining into the tank. Considering the tank was operational our method for waterproof injection had to be very conservative in order to not damage the tanks and increase the size of the leak. Due to sheer pressure of water proof injection it may cause further irreparable damage to the concrete.