The Thorp nuclear reprocessing plant at Sellafield, Cumbria, has recycled its final batch of reactor fuel. But it leaves behind a hugely toxic legacy for future generations to deal with. So how will it be made safe? Thorp still looks almost new; a giant structure of cavernous halls, deep blue-tinged cooling ponds and giant lifting cranes, imposing in fresh yellow paint. But now the complex process of decontaminating and dismantling begins.

An aquatic robot called Avexis is being tested in Japan ahead of being deployed into the damaged core of the Fukushima Daiichi Nuclear Power Plant. A link has been sent to your friend's email address. A link has been posted to your Facebook feed. An aquatic robot called Avexis is being tested in Japan ahead of being deployed into the damaged core of the Fukushima Daiichi Nuclear Power Plant.