A million litres (264,000 gallons) of water and the 1,500 tropical fish it housed were spilled out this morning when the AquaDom, the largest cylindrical aquarium in the world, which is situated inside the Radisson Blu hotel in Berlin, ruptured for an unknown reason. According to Berlin's fire department, two minor injuries from glass cuts resulted from the water, along with undetermined damage to the hotel. Before 6 am, a large explosion at the aquarium, a towering 25-meter-tall (82-foot) cylinder in the middle of the Raddison Blu hotel lobby, caused a flood that spread to Karl-Liebknecht Strasse, one of the busiest streets in the heart of the German capital.