In the complex of the Arena is located a small auditorium, a night club and a large exhibition space. Around the Arena are restaurants, bars, cinema and the Sky TV studios.
O2 Arena is also known as the "North Greenwich Arena", but its name "O 2 Arena" is after the British mobile communications company. The works began in 2003 and ended in 2007. It has 20,000 seats, making it the second largest sports venue in the UK.
An interesting detail about building arena, is that cranes were not able to be used for construction, because of the dome of the compound. Therefore, the roof of the dome was built on the ground and only later was hoisted to its place at altitude. The dome occupies about 40% of the arena.
A sound problem created initially was the echo that we know from indoor places. As part of building the hall, U2's sound manager, together with the acoustics engineers of the hall, worked to solve the sound problem. They succeeded in doing so, and to this day sound inside the arena does not suffer from sound problems.