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Public-images-osm logo.svg location = underground
Location underground.png
Indicate a given feature is buried or dug under the surface of the ground Show/edit corresponding data item.
Group: properties
Used on these elements
may be used on nodesmay be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)
Useful combination
See also
Status: in use

This tag is suitable for any feature located under the ground surface and may not be actually visible at a time of a surface survey.

Is it however possible to survey underground or from manholes (when opened by authorized personnel only).

Concerns with verifiability

As verifiability is an important concept in OSM, buried features may not comply with this principle.
Highway/railway/waterway tunnels should normally be verifiable since they are often visible or accessible by car, train or on foot.
When it comes to underground pipes or cables, markers may indicate the existence of a feature which is not visible from above ground. Such features may be considered sufficiently significant for the underground element to be added to OSM.

You should refer to Verifiability guidelines page at every survey you make of underground equipment.