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围绕 blackmesa.com 网站倒计时与 Xen 水晶相关图像的社区调查。论坛将其与《半条命》的黑山基地联系起来,但原帖不足以证明网站运营方或 Valve 确认过独立 ARG 身份。
原帖配图;来源与相关说明见原介绍帖。