It is located just 10m under the ground. Takes 166 steps from the entrance.
Roppongi Station (六本木駅) is very famous for its deepness. Hibiya Line's station is not so special, but Oedoline's Station is located really deep under the ground... or is it?
Tourist Info.
You have to buy a ticket to see how it's deep.
Access
0. at Ginza Station.
1. use Hibiya Line to Roppoing.
2. walk down 5 min.
30 min
Let's learn MJER Iaijutsu. 
映画好き集まれ！ 
It is located just 10m under the ground. Takes 166 steps from the entrance.