That is according to GeoConfirmed, a group of volunteers that maps Russia's war against Ukraine, The Kyiv Independent reports.
GeoConfirmed published videos showing Unmanned Surface Vehicles (USVs), or ship drones, attacking ships of the Russian Black Sea Fleet in Sevastopol, a port city in Russian-occupied Crimea, on Saturday, October 29.
Read more: 249 Days of russia-Ukraine War – russian Casualties in Ukraine

One of the published videos shows an alleged attack on a Russian Admiral Grigorovich-class frigate, and "only the Admiral Makarov matches this class for the Black Sea Feet," the investigation says. "The footage stops when the USV seems to impact on the vessel, it likely exploded," the investigation says.
GeoConfirmed Investigation.What happened in Sevastopol, Crimea?A @GeoConfirmed thread.We gathered a lot of footage en we will number our tweets xx/Thx @TilmanPlan4Risk for this picture.01/ pic.twitter.com/bJ4A3rcp1P— GeoConfirmed (@GeoConfirmed) October 29, 2022
The first videos emerged this morning.Video 01: Explosion in distance, filmed by a fixed camera.44.64545, 33.5368102/ pic.twitter.com/KRM1sVQZoq— GeoConfirmed (@GeoConfirmed) October 29, 2022
In this video you see the attack on an Admiral Grigorovich-class frigate. According to @CovertShores (9 May 22) only the Admiral Makarov matches this class for the Black Sea fleet.The footage stops when the USV seems to impact on the vessel, it likely exploded.Video 0819/ pic.twitter.com/vIlHCl4aOF— GeoConfirmed (@GeoConfirmed) October 29, 2022
Another video shows an attack on a Russian "Natya-class minesweeper." According to GeoConfirmed, 6-8 ship drones were used to attack the fleet.
In this video you can see the attack on a Natya class minesweeper, Soviet designation Project 266M Akvamarin.According to Russian MOD the Ivan Golubets received "minor" damage.The footage stops when the USV seems to impact on the vessel, the USV likely exploded.Video 0923/ pic.twitter.com/SC5ThNPP9I— GeoConfirmed (@GeoConfirmed) October 29, 2022
As Defense Express reported, Mysterious Unmanned Surface Vehicles Attacked russia's Black Sea Fleet's Main Base on Saturday.
Read more: Deputy Chief of Staff of Wagner PMC Was Eliminated in Ukraine by Warriors of Khort Special Unit