The CORE-LOCTM system is a highly dissipating and cost-effective armouring system for breakwaters that was developed by the U.S. Army Corps of Engineers. It consists of interlocking concrete armour units that provide superior hydraulic stability. Extensive physical modeling has been conducted on the system. The units have high porosity which reduces overtopping, and stress analysis and drop tests have proven their structural robustness. The units are simple and fast to cast, store, handle, and place using common equipment like forklifts and cable cranes. The CORE-LOCTM system has been used in many breakwater projects internationally.