Since this channel caters mainly to the engineering aspects of the marine industry and does not focus of hospitality or tourism we will the former in terms of a cruise liner. Basically the machineries and necessary equipment found on a cruise liner are same as that of other commercial vessels though the quantity might vary. For example the lifeboats and other safety equipment found on a cruise ship would be much greater that those found on a normal vessel having a complement of around two dozen people.
And yes I would also like to assure you that cruise liners are very safe and what happened to Titanic was an unfortunate incident. Regulations require cruise ships (infact this applies to all types of ships) the required fire fighting equipment, lifeboats, life-rafts, distress signaling equipment and so forth in accordance with local and international regulations governing the same. The pictures above show majestic cruise liners strolling across the waters carrying thousands of passengers who might be having some of the best times of their lives. The picture on the extreme right shows a futuristic project that goes by the name Project Genesis and the image shows an interior view of the proposed ship.