Link: http://www.scoopyweb.com/2021/07/drone-disguised-as-manta-ray-will-be.html
'Raydrive' is equipped with wings and 3D printed fins to help it glide on water. Device's sensors can collect information while remaining near undetectable. British government pumped £100,000 into fish-like drone's development. Considering a 'tuna drone' from same manufacturer. Animal Dynamics. Option to put a sensor package a weapon or camera in it.'