[laplata]

Looks like an SOS to me.

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I agree. Morse code.

[Gideon300]

Looks like an SOS to me.

I agree. Morse code.
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If it’s Morse Code it appears to be a continuous series of: MSMSMSMSMSMSMSMSMSMSMS. Automatic, not hand keyed.

But I don’t think it is. I think it’s an alarm of some sort, or someone playing around with a strobe light system.