NVa Cruisers

I traveled to Europe on the Andrea Doria in Feb 1956 with my family, and we had our return trip booked on the ship for July 1956. Fortunately for us we changed our booking to return on the Ile de France instead of the Andrea Doria, as we would have been on the ill-fated voyage. Our cabin was on the lowest deck of the ship, and we never knew the fate of the people who were in our cabin. The Ill de France arrived in NYC 3 days before the Andrea Doria sunk. One thing I remember from our crossing in February was that the different classes of passengers were segregated and there were locked doors preventing someone from a lower class to trespass into a higher class area. We were in the lowest class (tourist class) and we could only move around on the lower decks but not above the open weather deck. I wonder if during the collision whether the doors were unlocked to allow access to upper decks as the lower decks became flooded. I have memorabilia from the Andrea Doria, including pictures and several dining room menus, which I've kept for all these years as historical artifacts of that doomed ship.