The Radisson Blu in Berlin's lobby was flooded by water from a massive aquarium that has ruptured and contained a million litres of water.
The AquaDom, which is 15.85 metres (52 feet) tall and contains 1,500 fish, has been dubbed the largest free-standing cylindrical aquarium in the world.
After the explosion, glass that fell on two people caused injuries.
Berlin Police said there had been incredible damage.
As per Berlin's fire brigade, the vast majority of the fish had died in the explosion
James Klein, a fire brigade employee, was quoted saying that a few dozen fish were discovered alive in areas where leftover water had accumulated
As per reports, efforts are being made to save another 400–500 fish who were trapped without oxygen in smaller tanks beneath the hotel lobby.