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In page United States naval reactors:

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All nine of the U.S. Navy nuclear-powered cruisers (CGN) have now been stricken from the Naval Vessel Register, and those not already scrapped by recycling are scheduled to be recycled. While reactor accidents have not sunk any U.S. Navy ships or submarines, two nuclear-powered submarines, USS Thresher and USS Scorpion were lost at sea. The condition of these reactors has not been publicly released, although both wrecks have been investigated by Robert Ballard on behalf of the Navy using remotely operated vehicles (ROVs).[citation needed]