Northrop Grumman completed the assembly of a full-size uncrewed underwater vehicle (UUV) prototype known as Manta Ray. A new class of UUV, it is an extra-large glider that will operate long-duration, long-range, and payload-capable undersea missions without the need for on-site human logistics. Manta Ray will operate long-duration, long-range missions in ocean environments where humans can't go.