The Russian Woodpecker: A Soviet Signal That Could Be Heard on the Radio (2018)

22 点作者 magnetic大约 6 年前

1 comment

luizfzs大约 6 年前

This reminds me of <a href="https://en.wikipedia.org/wiki/UVB-76" rel="nofollow">https://en.wikipedia.org/wiki/UVB-76</a> A radio station that emits a horn sound periodically.