This place is a natural environment where you can get all kind of water-related products. The catalog of products offered is very diverse and awesome. Here you will find ponds, spray fountains, animated fishes and ducks, alligators, sculpted rocks, forests, underwater caves and much more. There is a new mesh zone with exclusive products for new viewers. As you know, mesh offers a high level of detail at very low prims.
You will also find water vehicles such as submersibles, hovercrafts and RC ships. Take a look at the main store. There you will find all you need to create your own aquarium. It is very cheap and offers a lot of fun. First choose your tank, then add a floor, background, fishes, plants and seaweed. There is a lot of accessories such as bubbles, rocks, sunken ships, a diver helmet, a lighthouse, a rusty anchor or a water sound emitter.
Finally take a look at Splash Scuba. Here you will find a lot of scuba diver outfits with tons of accessories, HUD and gadgets including an "out of air" simulator.