The MUSCLE (Minehunting UUV for Shallow waters Covert Littoral Expeditions) is a state-of-the-art mine hunting autonomous underwater vehicle, which uses multi-resolution, multi-aspect Synthetic Aperture Sonar to create detailed images of the sea floor.
In the picture, NATO STO Centre for Maritime Research and Experimentation (CMRE) staff work with the MUSCLE vehicle during MINEX 2018 and Dynamic Mariner 2019 sea trials.