Welcome back

I'd like to point you to
https://wiki.openstreetmap.org/wiki/Tag:military%3Dbunker
please check the lower part of the article. According to your description I'd venture to guess this is an abandoned or even ruined bunker. This can and should be reflected in the tags used.

Should you have any questions just ask

silversurfer83
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            Published using OSMCha: https://osmcha.org/changesets/161481972
            