Forwarding anonymous report from #mapycz user, please verify:
Wrong coordinates. It's actually called "Jaskinia Goryla" (Gorilla Cave). Located in the nature reserve "Kępa Redłowska". It's 23m long, up to 5m wide, up to 1m high. Very low entrance - need to crawl.
https://geostanowiska.pgi.gov.pl//gsapp_v2//ObjectDetails.aspx?id=5561