Britain's 17 defunct nuclear submarines – seven of which are moored at the Rosyth naval dockyard in Fife – would have been dumped at sea under plans drawn up by the Ministry of Defence.

A secret MoD briefing found in the UK National Archives reveals the ministry's "technical preference" was to dispose of the radioactive hulks at sea without dismantling them. Dumping in this way, however, would raise "many environmental and other issues", it said.

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