do you have to use the underground train from London bridge o2 arena or not?

No, you don't have to use the underground train from London Bridge to the O2 arena, but it is the recommended option. The O2 arena is located in Greenwich, which is about 6 miles (9.7 km) from London Bridge. The underground train journey from London Bridge to the O2 arena takes about 10 minutes and costs about £4.50 for a single journey.

If you are not travelling during peek times you can also take the DLR (Docklands Light Railway) from Bank or Tower Gateway.

There are also a number of other ways to get to the O2 arena from London Bridge, including:

* By bus: There are a number of bus routes that run from London Bridge to the O2 arena. The journey time by bus is about 20 minutes and costs about £2.50 for a single journey.

* By car: The journey time by car from London Bridge to the O2 arena is about 15 minutes, depending on traffic conditions. There are a number of car parks at the O2 arena, which charge a fee.

* By taxi: The journey time by taxi from London Bridge to the O2 arena is about 15 minutes and costs around £25.

The best way to get to the O2 arena from London Bridge will depend on your budget, time constraints, and personal preferences.