A massive aquarium in Berlin with 1,500 fish explodes.

The Radisson Blu in Berlin's lobby has been inundated by water from a massive aquarium that has ruptured and contained a million liters of water.

The "AquaDom," which is 14 meters (46 feet) high and contains 1,500 tropical fish, has been dubbed the largest free-standing cylindrical aquarium in the world.

Glass struck two persons, injuring them.

Police described the damage as being "amazing." On video, there was an empty tank, water was gushing into the lobby, and there was trash all everywhere.

As a result of the incident, guests were escorted from the hotel around 05:50. (04:50 GMT).

What were the front doors to the Radisson Blu now swing into the street, bent at an angle by the force of the exploding tank, and are surrounded by a pile of rubble.

With his girlfriend, Paul Maletzki was lodging on the fourth floor.

He recalled shaking and hearing a loud noise that awakened him up. He noticed water streaming across the lobby when he peered down into it. Later, armed police officers led them and other visitors out of the hotel.

Franziska Giffey, the mayor of Berlin, visited the hotel to assess the damage and compared the tank explosion to a tsunami.

She expressed relief that it had occurred so early in the day, noting that if it had occurred an hour or so later, the lobby and the street outside would have been crowded with guests, many of whom would have been children.

Since the aquarium was updated two years ago, visitors can use a clear-walled lift inside. The hotel advertises that some of its rooms have views of it.

More than 100 firefighters were present, according to Berlin's fire department, and the cause of the breach was unknown.

It claimed to have utilized rescue dogs to search the hotel's interior for any potential victims, but no one was discovered.

Police warned locals to drive carefully as "huge amounts" of water were gushing into the streets nearby.

According to a police source who spoke to the local media, there is no proof that the break was caused by a targeted attack.

The Karl-Liebknecht street outside the hotel has been blocked, according to Berlin's public transportation administration, because to "an extremely high amount of water on the road." The area's tram service was also suspended.

There were more than 100 distinct fish species in the aquarium.

On Friday, the attraction posted a notice on its website asking guests to reschedule their tickets due to a temporary closure of the attraction.

The largest cylindrical aquarium in the world, AquaDom received the Guinness World Record after it debuted in December 2003.

Its construction reportedly cost about €12.8 million (£11.2 million) at the time.