Key:underground

underground
Description
Using this tag is discouraged, use location=underground instead. 
Group: Properties
Used on these elements
See also
Status: deprecated

This feature has been labeled as deprecated. The recommended replacement is: location=underground.
The reason is documented in Deprecated features. You are still free to continue to use or interpret this tag as you see fit since OpenStreetMap does not have “banned features”.
Under no circumstances should you (semi-)automatically change “deprecated” tags to something else in the database on a large scale without conforming to the automated edits code of conduct. Any such change will be reverted.

Use underground=* in addition to main feature, for indication that feature located under ground.

Consider using far more widely used and standard location=underground

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