The Sunken City of Baia

Welcome to the Atlas Obscura Community discussion of The Sunken City of Baia in Baia, Italy. Ask questions or share travel tips, experiences, pictures, or general comments with the community. For the story behind this place, check out the Atlas Obscura entry:
https://www.atlasobscura.com/places/the-sunken-city-of-baia-baia-italy?utm_source=atlas-forum&utm_medium=referral

Can you visit the sunken city independently or is it mandatory to go with a guide? if a guide is required can someone direct me to the best affordable option?