Sometimes getting the boxes off the floor doesn't help.
I had a friend who had a water pipe leak in his basement. Yes it flooded the floor, his comics were up on shelves a foot off the floor. The bottom shelf was still touched by the water, and the pipe was ABOVE his boxes so the water got into all of the boxes from above.
The collection was about 12 long boxes all bagged and boarded in poly bags. Going through it the front half of each long was pretty water soaked, and the bottoms of 4 longs were badly soaked from the bottom. We managed to save about half of the books, the rest were garbage. Drove my friend from comic collecting and I bought the rest of it. Kept some of it in my personal collection, the rest I sold as dollar books.