The robots helping clean up Sellafield's nuclear waste

Sellafield in Cumbria was the birthplace of the British nuclear industry.

Now it is a nuclear fuel reprocessing and decommissioning site where the process of cleaning up the radioactive waste is only just under way.

It's difficult and dangerous work for people, so tough little submarine robots are being used instead.

The BBC's Theo Leggett reports on the tech tackling our nuclear waste.