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In page Operation Deadlight:
"In the late-1990s, a firm applied to the British Ministry of Defence for salvage rights to the Operation Deadlight U-boats, planning to raise up to a hundred of them. Because the U-boats were constructed in the pre-atomic age, the wrecks contain low-background steel metals that are not radioactively contaminated and valuable for certain research purposes.[1] The ministry awarded no salvage rights, due to objections from Russia and the United States, and potentially from the United Kingdom.[citation needed]
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