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As many of the oil and gas platforms in the North Sea come to the end of their useful life, they're due to be decommissioned - sealed off, cleaned up and taken apart. The cost of this has been estimated to around 拢50bn and much of this will be footed by the taxpayer due to the tax breaks offered. But are there alternative solutions which might benefit the environment more?

Tom Heap has exclusive access to an onshore decommissioning facility in Norway to which an oil platform has just been transported whole in a 'single lift'. He investigates the clean up process and asks how easily the sea floor can be returned to its natural state. He investigates if the alternatives are worth considering - could cleaning them up and leaving them in place actually form a sanctuary for marine and wildlife and allow the billions saved to be invested into environmental issues instead?

Produced by Anne-Marie Bullock.