Official

Underground shopping malls and underground passages are connected endlessly to surround JR Tokyo Station.
South side　→　Underground passage of Harumi-dori St.
East side　→　Yaesu Underground Shopping Center, etc.
North side　→　Underground passage along the Tozai Line
West　→　Underground passage along the Chiyoda Line
When you walk around, you will find something strange.
On one half of the passage from Ginza Station on the Marunouchi Line to Yurakucho Itoshia, there is a staircase that goes up just down, so to speak, "Itetsu Staircase". There's even a handrail. Is there anyone going up and down here?
In fact, there is an underground structure on this, so it seems that it was impossible to pass through the passage without such stairs.
In the connected underground passage, there is also a "going stairs" in the direction of Otemachi, so why not look for a walk?