Under the offer, Ariel Castro will spend the rest of his life behind bars plus 1,000 years, without the possibility of parole after he pleaded guilty to the abduction and abuse of three women over a decade.
Castro was charged with 977 counts including kidnapping and rape for snatching the women, holding them in captivity, and brutalizing them for years.
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Explosives experts were called to the nuclear reprocessing site in Cumbria, to help deal with chemical substances.
The arrests were made on suspicion of producing and disseminating pedophilia content on the internet, the country's Justice Ministry said.
The A4-sized sketch originally went for £75 when it was first sold.