Don't @ me about footprint but this is on the way to having the personal CO2-Footprint of the actual cruise ship by going so often all the breakdowns per passenger just end up at 100% again
There are cruise ships that people live on. Like, they don't book them out, you buy a spot on the ship and they just go around the world and stop places. There are multiple year-long cruises, dozens of month-long ones. Most of the ships have been in service since the 70s, sold, resold, refitted. It's truly a cursed industry.