One person reported the sound in Land’s End, saying: “I had been hearing it for weeks and felt like I was losing my mind.”
Another Twitter user said: “This is the part were aliens invade right!?”
A second person said: “First time I heard it I went into panic mode, like wtf now.”
A third person tweeted: “It is definitely creepy, and don’t let it be foggy, otherwise, super creepy, but, great for creepy filmmaking.”
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Another person said: “Can someone explain me why is this eerie sound has been going on for an hour in #SanFrancisco”
Similar phenomena have been recorded in the UK ... Read even more
