A mysterious SOS sign made of rocks spotted by a pilot flying over Swift Bay in Western Australia has perplexed authorities.。

A ground search of the remote area quickly followed but yielded zero "recent human activity."。

SEE ALSO:These Australian versions of Pokémon are truly magnificent
 。

The signal raised concerns that people could be stranded, and authorities have turned to the public for help.。

Mashable Top StoriesStay connected with the hottest stories of the day and the latest entertainment news.Sign up for Mashable's Top Stories newsletter。By signing up you agree to our Terms of Use and Privacy Policy.
。By signing up you agree to our Terms of Use and Privacy Policy.。

Thanks for signing up!。

"Police are trying to establish if there are any missing persons in the area who require assistance," said authorities in a statement. "Anyone who can assist police with locating or identifying the person(s) who made the SOS is urged to call Crime Stoppers on 1800 333 000, or report the information online at www.crimestopperswa.com.au." 。 It's also possible that the sign was made a long time ago, or that it's just a。It's also possible that the sign was made a long time ago, or that it's just a。

really really funny and not at all dumb
。

---

prank.  。

---

SOS signals can be critical to rescue operations. Last August, a couple drew an SOS in the sand that successfully led to their rescue. So, don't cry SOS without really needing help, people. And if you made the sign, get in touch with the police.
。

---

Featured Video For You。Featured Video For You。Scuba dive tankless with this floating air caddie。