concrete bunker entrance with biohazard symbol and roller shutter door building security |
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| navigate by keyword : bunker concrete entrance building security biohazard warning symbol danger hazard roller door shutter industrial architecture facility secure protection safety alert caution forbidden restricted access gate metal yellow triangle environmental health emergency science research laboratory containment hazardous material storage military defense government structure modern exterior isolated white background |
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| A front view of a concrete bunker-style building with a large, silver roller shutter door. A yellow biohazard warning symbol is prominently displayed on the right side of the concrete wall. Yellow bollards are positioned on either side of the door. The building has a flat roof with some visible fixtures. The image is isolated on a white background |
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