Each area has its own way of diving, especially from which boat you dive. Each liveaboard has support boats that make the dive possible and can pick you up if necessary. You can think of a zodiac, a dhoni or a skiff. You will all be told on board how to safely get into those boats, enter the water or get out of the water. The crew and guides will help you as much as possible, although you can imagine that some disabled divers may have a lot of trouble with it. If you are somehow challenged, please check with your travel organization before booking the trip.