Secret Chambers of Salona

I recently found out about a structure next to the Five bridges section in Salona. While Five bridges is basically a bridge with 5 arches, this other construction seems to be an extension of it.
The entrance was quite uninviting and uncomfortable but I managed to get inside and enjoy this, rarely seen unique space. The archaeologists are certainly aware of it but a proper scientific paper is needed.
I don't have sufficient knowledge about Roman architecture to come up with any conclusions so my best guess would be that this was another bridge but also a cistern of some sort due to nicely plastered interior.

UPDATE: I received a call from an archaeologist saying that this is a water distribution system.

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NOTE: entering spaces like this is solely at your own risk! There is nothing to damage inside or to take out, but still be respectful of the heritage!

For more details, here is the link to my blog: https://secretcroatia.blog/
I started the blog back in 2009 so feel free to dig through other stories!

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Zeiss 18 mm lens: https://www.bhphotovideo.com/c/produc...
Rode VideoMic: https://www.rode.com/microphones/vide...