Josephus mentioned these in his writings. If they are the escape tunnels, there should be a treasure trove of valuables the Jews lost trying to get them out of Jerusalem before the Romans sacked the city. Even the sewage area has the potential for some real artifacts since many Jews swallowed their valuables before leaving the city.
"Josephus mentioned these in his writings."
Could you be more specific please?
I'd like to read more, but the cock will crow again before I have the time to research the veracity of that remark.
Here below is one site that I'd consider perusing for info.
No disrespect intended, I just want to learn more. Thank You!