The Napa County Sheriff’s Office is continuing its search for a man believed to have drowned on Sunday afternoon at Lake Berryessa.

Dixon resident Clint Rasmussen, 36, was boating at the Steele Canyon area of Berryessa with his family when he did not re-surface after diving into the water.

The sheriff’s office is borrowing an underwater search vehicle from Shasta County authorities to look for Rasmussen, Sheriff’s Lt. Tracey Stuart said. The vehicle will arrive Wednesday night and officers will use it to search for Rasmussen beginning early Thursday morning, she said.