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In page Sellafield:

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Radiation around the pool could get so high that a person was not allowed to stay more than 2 minutes, seriously affecting decommissioning.[4] The pool was not watertight; time and weather had created cracks in the concrete, letting contaminated water leak.[5] In 2014 photographs of the storage ponds were leaked to the media, showing they were in poor condition with cracked concrete, vegetation growing amongst machinery and seagulls bathing in the pools.[6]