that and says the drone, used for gathering weather and temperature data, is not armed. The drone was returned several days later. 2020s Design Gliders External fins perpendicular to the frame of the UUV which allowed for a linear movement of the UUV and deeper, controlled dives. These gliders use buoyancy derived propulsion which increases the duration of dives and their range through up and down movement in the ocean. Manta ray In September 2021, researchers at a Chinese university developed a manta ray shaped UUV with the purpose of collecting information around the Xisha Islands. Some UUVs are designed to mimic the silhouettes of animals to facilitate movement and prevent detection. The manta ray design allows the UUV to camouflage with the marine life and contributes to the ease at which the craft swims through water. Oxygen/hydrogen air-independent propulsion UUVs are oxygen dependent vehicles which require to resurface. With the development of a propulsion unit that does not require oxygen or hydrogen, the ability for the UUV to stay continuously underwater increases drastically. Lithium and water power source The newest source of power for UUVs could be the free energy reaction of Lithium/water as it produces 8530 Wh/kg. 5% of this energy would surpass the already established sources of energy densities found in today's UUVs. The power source would essentially consume the water around the UUV and manipulated it to produce energy through chemical reactions which would power the UUV. Applications Military The US Navy began using UUVs in the 1990s to detect and disable underwater mines. UUVs were used by the US Navy during the Iraq War in the 2010s to remove mines around Umm Qasr, a port in southern Iraq. The Chinese military uses UUVs for mostly data collection and reconnaissance purposes. On December 20, 2020, a fisherman in Indonesia spotted a glider-shaped UUV near Selayar Island in South Sulawesi. Individuals from the Indonesian military have categorized the vehicle to be a Chinese Sea Wing (Haiyi), created for the purposes of collecting data including water temperature, salinity, turbidity, and oxygen levels that can help chart optimal submarine routes. The navies of multiple countries, including the US, UK, France, Russia, and China are currently creating unmanned vehicles to be used in oceanic warfare to discover and terminate underwater mines. For instance, the REMUS is a three-foot long robot used to clear mines in one square mile within 16