The deep, blue sea really holds a lot of mysteries, and one of these just surfaced on the touristy Bonfil Beach, in the city of Acapulco, in the south-west Mexican state of Guerrero.

A raw video uploaded by the Civil Protection and Fire Brigade in Acapulco showed a humongous, grey creature that washed up on the sandy shores.

In the minute-and-a-half long video, a man is seen poking the unidentified sea monster using a stick, and scrutinising its body and what seems to be tentacles.

Throughout the video, however, the mystery creature appeared unresponsive, just lying on the beach covered with sand.

In a report by local Mexican station 24 Hours, Civil Protection and Fire Coordinator Sabas de la Rosa Camacho was quoted as saying that the animal, estimated to be more than 13 feet long, could be a giant squid or a whale. Quite notably, however, the creature is said to have bones.

Camacho further said the sea monster likely spent a long time floating in Acapulco's strong currents caused by inclement weather, before ultimately being washed up on the shore.

He added that the carcass, which has been reported to environmental agency Procuraduría Federal de Protección al Ambiente (Profepa), did not have a foul smell, despite its unusual appearance.

"We have no idea what type of animal this is, but I do know that it does not smell bad or have a fetid aroma. It is four meters long and was found on Bonfil Beach," Camacho was quoted by The Daily Mail as saying.

Although uncertainty still surrounds the sea creature, one thing is for sure: it has already attracted a large number of local and foreign tourists.

The video of the strange animal uploaded by the Civil Protection and Fire Acapulco has already created much social media buzz, being shared more than 107,000 times on Facebook. Photos taken by locals and tourists of the bizarre creature are also beginning to turn viral.