'Unbelievable maritime damage': Giant aquarium housing 1,500 tropical fish bursts in Berlin

A huge aquarium in Berlin burst Friday, causing glass, water and hundreds of tropical fish to spill out of the Sea Life tourist attraction in the heart of the German capital.

A wave of debris swept out of the building, which also contains a hotel, cafes and a chocolate store, as 1 million litres of water poured from the aquarium shortly before 6am, police said.

Two people suffered light injuries from glass splinters and were taken to hospital and all the fish died. Rescue dogs were searching the building for anyone who might be trapped under debris, Berlin's fire service said, while police said on Twitter there had been "unbelievable maritime damage".

"It was a full-on tsunami," said Berlin Mayor Franziska Giffey, adding that it was pure luck the incident had happened in the early morning when very few people were around.

"Despite the terrible destruction we're seeing, we're lucky people weren't seriously injured," she told reporters.

The 1,500 fish in the tank however "could not be saved", Giffey added. More than 100 emergency workers were at the scene, which was scattered with glass and other debris.

Here's how the world's largest freestanding cylindrical aquarium looked before the incident:

Here's a video clip of the aftermath:

The cylindrical AquaDom, which opened in 2004, has long been a popular tourist attraction in the German capital. It is located in the foyer of a Radisson Blu hotel and had a clear-walled elevator built inside to be used by visitors to the Sea Life leisure complex.

According to the Sea Life website, the AquaDom is the largest cylindrical, freestanding aquarium in the world. Among the 80 types of fish it housed were blue tang and clownfish, the species known from the popular animated movie “Finding Nemo”.

Hotel guest Claudia Gonzales said she "jolted out of bed" when the aquarium burst. "It sounded almost like a firework but the hotel actually shook inside," she told AFP.

Berlin police said water had "massively" leaked onto the adjoining Karl Liebknecht Street, forcing the partial closure of the major traffic artery. Tram service was also suspended. The area around the hotel remained sealed off by the early afternoon.

The deluge of water left a path of destruction in its wake, breaking windows and doors and sweeping chairs, tables and plant pots into the street outside the hotel.

Pictures and videos circulating online, apparently from guests staying at the hotel, showed extensive damage to the transparent aquarium, with only the frame still standing.

German lawmaker Sandra Weeser, who was staying at the hotel when the aquarium burst, said she was woken up by "a kind of shockwave". "There was a slight tremor of the building and my first guess was an earthquake," she told the Berliner Morgenpost newspaper.

The area where the aquarium once stood was now just "dark and wet", she said, recalling how she saw "one of those large parrot fish lying on the ground, frozen".

Around 300 guests were staying at the hotel. They have been evacuated.