The Synthetic Collective Unmanned Underwater Laboratory (SCUUL) testbed is a multi-vehicle testbed that is used to evaluate the performance of underwater motion coordination algorithms in a dynamic environment. The SCUUL testbed consists of six propellor-driven vehicles, a 367,000 gallon tank, and an underwater motion capture system. The tank is the Neutral Buoyancy Research Facility (NBRF) located at the University of Maryland and operated by the Collective Dynamics and Control Laboratory (CDCL) and the Space Systems Laboratory. The motion capture is a state-of-the-art system developed by Qualisys in Gothenburg, Sweden. Initial results have shown the capabilities of the separate components of SCUUL and its ability to test and evaluate a multitude of motion coordination algorithms in a laboratory environment.