Not to be morbid, and this isn't going to happen if you slightly exceed the weight limit, but if you go totally overboard the whole slide could break and you'll all get seriously injured or killed. A heavier group will keep more of their momentum through the turns and therefore more of their speed.
The Ultimate Abyss on Royal Caribbean cruise ships is not a waterslide; it's a pair of side-by-side, 216-foot-long slides that run 10 decks, from the Sports Zone (Deck 16) to the Boardwalk (Deck 6) at the back of the ship.
Guests climb to the slide's glass platform, taking in the view from the top of the tallest slide at sea. From there, sliders launch into 216 feet of tunnels, whizzing past multi-sensory effects and blast onto the Boardwalk 10 decks below.
At more than 150 feet above sea level, the Ultimate Abyss on Oasis Class ships is the tallest slide at sea. Thrill seekers begin their adventure at the slide's glass platform and then launch down 10 stories of twist and turns, whizzing past multisensory effects before blasting onto the Boardwalk.
The Ultimate Abyss takes the form of a ferocious anglerfish with a huge dorsal fin and two spindly bodies. To reach the double tubes, you walk past the aptly named Wipeout Bar and climb some stairs that take you through the fish's open mouth, complete with 40 giant pointed teeth, until you reach the glass floor.