The protocol is to drop both anchors to slow the ship.
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Not at 12knots.
Marine traffic showed the vessel traveling at 8.7 kn when power went out. The ship was thrown into reverse, producing a cloud of black smoke from the revving diesels. And I heard a report that the crew was able to get one of the two anchors down, but to no effect. Well, to some effect. the ship slowed to 5.3 and still had enough speed and mass to destroy the bridge.