When did the water flood 3rd class cabins aft

Were the 3rd class cabins located aft on the starboard side some of the first sections of the ship to flood? What exact deck level was torn open by the iceberg, was it Orlop deck or G deck? And if yes, how long did it take the water to reach the cabins above?
Well, Mette, the thing to remember is that when the pointed end is going down the blunt end is going up. Or did you mean forward rather than aft? :)