La Crypte archéologique -> reservation needed?

Doesn't look it.

https://www.crypte.paris.fr/en/visit/access-opening-times-accessibility/museum-admission

Free Admission (upon presentation of a valid ID):
Youth 17 and under, disabled and their personal care attendant, job seekers and beneficiaries of the following income support supplements: RSA, single parent allowance, personalized autonomy allowance and state social assistance for refugees, city of Rome inhabitants ( Paris twin City), city of Paris employees and councilors in activity or retired, professional visual artists with written evidence, Art World professionals: International Association of Art Critics, museum guides, French and foreign curators, “la commission du Vieux Paris”, ICOM and ICOMOS members, journalists, art press reporters and federations.

The Paris Museum Pass offers free admission (without waiting in line) to the permanent collections of more than 60 museums and monuments in and around Paris, including the Archeological Crypt in the Notre-Dame parvis.

Thanks. My google and reading failed me last night 😐

lol no worries, it gets difficult to go through all the sites and figure out what they mean - not all the translations are well worded!

Nope no reservations needed and it is not usually busy. I just walked up in April in the afternoon. IF you enjoy Virtual Reality buy that short program at the ticket office. I am fearful of heights and thus had to yank the glasses off a time or two, lol. but it was interesting.

I was there about a month ago and walked right in. I didn't have a reservation.