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Ukraine‘s SBU intelligence service said the blast left the bridge in an “emergency state” after devastating its foundations.
It was at least the third attempt to destroy the key road and rail link from Russia to occupied Crimea.
The same SBU special forces unit behind Sunday’s historic drone strikes in Russia claimed responsibility for the pre-dawn attack.
They claimed their agents spent months mining the substructure of the 12 mile road and rail link.
The SBU said: “The SBU conducted a new unique special operation and struck the Crimean Bridge for the third time — this time underwater.”
They added: “The operation lasted several months. SBU agents mined the supports of this illegal facility.
“Today, without any casualties among the civilian population, at 4.44am in the morning the first explosive device was activated.