 This paper introduces a novel 3D scanning system designed specifically for use in underwater environments. It uses structured illumination to capture three-dimensional data from underwater archaeological sites and sunken shipwrecks. The system consists of two monochrome measurement cameras, a projection unit that generates periodic sinusoidal fringes, two flashlights, a colored camera, an inertial measurement unit, IMU, and an electronic control box. The paper discusses the advantages and disadvantages of using this system over other 3D recording techniques like laser scanning, ultrasonics and photogrammetry. It also provides some examples of how the system has been applied in real-world situations, including the documentation of underwater sites and the generation of detailed 3D models with texture and color information. This article was authored by Christian Brower-Burchart, Christoph Monkelt, Michael Blyer and others.