The category "watercraft" encompasses a wide variety of water-borne
vehicles from ships to submarines to hovercraft. There could scarcely be a bigger range in size between
the largest and smallest models in this category. The biggest and
most complex model actually wasn't sold as a submarine at all but as an
alternate model to the
8480 Space Shuttle. All models have propellers,
but there are not many other similarities. The
comparison
table
lists all of the various features.
Oddly, my favorite is the set that is an alternate model,
8480. I also really enjoy
8839 because it is so totally unlike anything
else Technic has done and is so well executed.