NANAKULI, Hawaii (KHON2) -- Drone video from around sunrise on Saturday, Nov. 30 showed hundreds of sandbar sharks right off of Electric Beach in Nanakuli. Get Hawaii's latest morning news delivered to your inbox, sign up for News 2 You Videographer John Marshall said he could barely believe his eyes. "And so I think they were just feeding honestly, but I truly don't know," Marshall said. "Seeing that many of them where it looks like a tornado of sharks, I don't see how they could all eat!" Protecting Hawaiʻi’s apex predators for a healthier ocean, ecosystem Hawaii Institute of Marine Biology (HIMB) PhD candidate Paige Wernli said it is a behavior called schooling, where members of the same species swim in a coordinated manner. "It could be social, it could be food-related, it could be, I don't know if there was something environmental going on with the outflow from those pipes if it was warm water or what it was," Wernli said. Ocean Safety confirmed that a surfer was knocked off of his board after a shark rammed him from underneath on Saturday. Former Ocean Safety rescue operator trainer Mel Puu now instructs most of West Oahu's junior lifeguards through his nonprofit and even created his own personal drone program. "We fly every morning prior to sending the kids in the water. And while they're in the water as much as we can, we'll keep the drone up," he said. Puu has had to call off three trainings since Fall, 2023 -- two were over the summer of 2024 -- due to sightings. "And it's proven itself time and time again. Yeah, we were able to find those big sharks, you know, get the water cleared of anybody that's in the water and then basically follow the sharks out so that we know where they're at," Puu said. Honolulu Ocean Safety said shark warning signs have been posted 105 times on Oahu in 2024. The Department does not currently have its own drones for monitoring but said it does work with partners like the Honolulu Fire Department and the Department of Land and Natural Resources to use drones. Ocean Safety added it is looking into technology to enhance safety beyond the lifeguard protocols. Check out more news from around Hawaii "Yeah, It could definitely be a great tool just in terms of, you know, letting people know if there's been a shark in the area, though it's not 100% that that is the only shark in the area," Wernli said. New York State began using drones to monitor sharks in 2023. There have been six shark-related incidents in Hawaii in 2024, including the fatal incident with pro surfer Tamayo Perry.