The Explorer is one of the newer ships in the world of ocean liners. It was commissioned in 2016. There are ships that are 30+ years old. Of course they get gutted and re-built every ten or so years. It is considered by cruise experts as the most luxurious commercial cruise ship in the world... it really is quite nice. Also it is small by today's standards... 750 passengers. Many of today's ships (mostly the ones used for less expensive cruises) hold 5,000+ of your new best friends. The rule of thumb is the fewer people the more costly.