I make a copy of the front page (picture page) of my passport and keep it with me ahsore.
In the Caribbean you get to keep your passport usually but on European cruises they keep them upon check in.
The only time we had to have them was in Russia and you can pick them up from the Purser.
You will get them back the last night of the cruise.
Alexandr Pushkin, Carnival-Holiday, HAL-(old)Westerdam, Orient lines-Marco Polo, Royal Olympic-Olympic, NCL-Dream, Dawn-Princess, ACCL-Grande Caribe, Oceania-Insignia (3), Regatta(4) Marina (1) St Lawrence Cruise Lines-Canadian Empress
Scenic River cruise June 11,2012