The search for the gun used in a mass shooting in Oakland Monday takes investigators under water.
Oakland police say One Goh shot and killed 7 people at Oikos University Monday morning, then drove a victims car to the Shoreline Center off Doolittle Drive and tossed a hand gun in the water before turning himself in to security at a market in Alameda.
Police used boats to search for the weapon with no luck. Volunteers with the Alameda County Underwater Search and Rescue team suited up late Tuesday evening to dive in and actually feel the silty floor for the gun.
It's a methodical search with crews on shore using rope to guide divers in the water. Divers say it's a difficult search because day or night there is no visibility.
Police say they want to recover the gun because it's an important piece of evidence and a safety hazard.