Can anyone guess what this small hole filled with water, in the center of a fort built in the 1600s on an island just off the coast of Colombia was used for?

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Is this the categena castle/fort? I can't recall, maybe torture with a prison cell underneath? Drip drip drip

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just saw the answer, nice fun fact i've never encountered. 

no, I haven't but i've been to Castillo de la Concepción...I think it's the main one in Cartegena. Will need to go to the Bocachina one next time.

We stayed in downtown Cartegena art district by the sea, beautiful city with a fantastic street market and lots of artisans. We then went to playa baru on the caribbean side. Will certainly go back a gain, we loved it!

Good guess but no 😅

And yes, the fort is in bocachina Cartagena. Have you been here?

Answer:

Small narrow tunnels shot outward and connected to the sea. As boats approached they could tell which direction the boats were coming from by observing the water’s movement in the hole.

The local guides called it a sefon, and we made a joke it was a sea-phone, because it was a communication device for the sea. 

Pretty neat engineering design.

There were some good guesses in the replies.

Here’s the answer and here’s 250 $degen for taking a guess 🙏

Here’s the answer and here’s 250 $degen for taking a guess 🙏 

https://warpcast.com/adrienne/0xf90fc5b6