whistles

Hi, I was wondering if anyone can tell me how many sets of whistles the titanic had that functioned? I know it had a set of 3 whistles of different sizes on all four funnels. But did all four sets actually work when the horn was blown? Reason I am asking is because I have been trying to find...

I heard somewhere say that when the Titanic was found, the funnels were not found in the debris field. An explanation that was given was that they rolled away on the ocean floor. Can anyone comment on this as to whether the funnels were found in the debris field or did they simply roll away...