sentences:  A scientific diving operation that follows the usual procedures of a commercial scuba operation will include one or more working divers, a stand-by diver and a supervisor, who will manage the operation from the surface control point.If the divers are tethered, there will generally be a line tender for each tethered diver in the water The stand-by diver may remain out of the water at the surface or may accompany the working diver or divers in the water.Surface-supplied and saturation operations will also generally follow standard procedures used by commercial divers.