A liveaboard boat is like a floating hotel that you can scuba dive off. They have cabins to sleep in, on board lounges, kitchens, however and tiolets. Some even have onboard luxuries like a Masseuse. In Phuket they range from over night trips up to 8-9 day adventures. You will need to be a certified diver to scuba dive from them however non divers can come on for the ride.