A blaster must conduct all underwater blasting and no shot may be fired without the blaster's approval. Casings and loading tubes made of dissimilar metals are not allowed because galvanic action between the metals and water can create transient currents. Marine blasting must use water-resistant detonating cord and blasting caps only, and when a loading tube is needed it must be a nonsparking metal tube. No shot may be fired while a vessel under way is within 1,500 feet of the blasting area, and anyone aboard a moored or anchored craft inside that 1,500-foot distance must be told before firing. No blast may be fired while swimming or diving is in progress nearby; where such operations are under way, signals and arrangements must be agreed so no shot is fired while anyone is in the water. Blasting flags must be displayed. Explosives stored and handled on vessels used for underwater blasting follow the Subpart U storage and handling rules. Where two or more charges are placed underwater, each one needs a float device fixed to one of its elements so it is released by the firing, and misfires are handled under 1926.911.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.