G'day, Sarah and Prissy.
There was no pool for second class and the pool for first class was not worth calling a pool. It was a tiny affair, I think 36 feet x 13 feet, filled with warm sea water. Its use was segregated by sex and costume was neck to knee at least. Quite unromantic!
SOS does not stand for Save our Ship, Souls or Sausages. The signal was chosen because it's easy to send and to recognise. It's simply ... --- ...
A lot of books state that Titanic was the first to send an SOS but this is not correct. The most likely candidate for that dubious distinction is an American ship called Arapahoe (often incorrectly spelled) or just possibly the Cunard liner Slavonia.