The Guam Fire Department has identified the 55-year-old missing man as Kenneth Bigbee.
According to GFD, Bigbee may have ventured into the waters to dive, alone, in the Tanguisson Beach area.
GFD units were requested at 9:10 am. Units arrived at the scene at 9:33 am.
Currently, GPD, GFD, and Coast Guard units are within that area conducting search efforts.