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The 82ft-high tank, located in the foyer of the Radisson Blu hotel in central Berlin, burst at around 5.50am, killing all of the 1,500 tropical fish housed there.

The shattering of the AquaDom aquarium sent one million litres of water gushing into the lobby and cut off electricity in the hotel. Two people were injured from glass shards and received treatment at hospital.

However the toll could have been far deadlier had the freak accident occurred an hour later, when the hotel lobby is usually packed with visitors.

Berlin mayor Franziska Giffey told broadcaster RBB: 'If this hadn't happened at 5.45 am but even just one hour later, then we would probably have had terrible human loss to report.'

There was speculation freezing temperatures overnight caused a crack in the glass tank, which then exploded under the weight of the water - but police are still investigating the cause.

Ms Giffey said the incident had unleashed a 'veritable tsunami' of water but the early morning timing had prevented far more injuries.

'Despite all the destruction, we were still very lucky,' she said. 'We would have had terrible human damage' had the aquarium burst even an hour later, once more people were awake and in the hotel and the surrounding area, she said.

The explosion filled the hotel lobby with over a million litres of water, some of which reached the outside of the complex, prompting police to close a nearby street.

There was speculation freezing temperatures that got down to minus 10 degrees Celsius (14F) overnight caused a crack in the acrylic glass tank, which then exploded under the weight of the water.

Police said there was no evidence the incident resulted from an attack.

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