Actually lol, it was on page 64-65 of "Farewell Titanic"
Oh, so I was wrong, actually, apologies!
"in 2001, historian and artist Ken Marschall began a count of porthole openings that would eventually combine the photographic results of more than twenty years of expeditions, all the way through 2010. Along the portside, Marschall counted 132 portholes that were located in regions of the hull not ruptured, bent, or otherwise deformed by the final crash on the abyssal plain. Only in uncrumpled areas could people's intent be guessed at; of the 132 portholes, including a porthole under the front of the well deck, 18 percent appeared to be open. On the starboard side, 17 percent of the 114 C-and D-Deck portholes appeared to be open. "
"Marschall concluded that once the bow section broke away and begun plunging toward the bottom, any open E-Deck and F-Deck portholes would probably have swung shut and possibly "only appeared 'closed' today from the outside. So we'll never know how many of the E and F deck ports were undogged [not locked with a pin]-unless someone wants to take the time and expense of manually pushing on each and every port [with a submersible's arm] to see if it pushes inward, open." "
phew, that took me a while. Thoughts?