Thirteen sharks and hundreds of fish have had to be moved as Sea Life in Blackpool drain the ocean tank for the first time in 23 years.
Almost 8,000kg of glass are being replaced.
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Officers are appealing for information from the public to help trace a missing Warrington man.
Samuel Brown has today been jailed for 18 months for sexual offenses against a 15-year-old girl.
Emergency services are treating the incident as a suspected gas explosion at the moment. Two people are believed to be seriously injured.