FTL has extensive experience developing payload systems for Unmanned Underwater Vehicles (UUVs) including extensive fluid modeling of the flow and mixed-phase environment surrounding a moving submarine. This has included unique calculations, models, and experimental testing of large bubble plumes in pipes, pools, and open ocean. In particular, FTL has investigated the existence and use of pressure effects from bubble plumes and moving vessels detected by custom undersea pressure sensor arrays, and verified through computational fluid dynamics calculations.