The Museum of the World Ocean is made up of a submarine, exhibition halls, Marine machinery, and several ships.
The main building is situated between the Vityaz and the submarine. It is also home to 14 marine and freshwater tanks that contain over 130 species of sea life. Some of the underwater creatures that you can expect to find here are Piranhas, sharks, rays, and shellfish. The museum is not huge; however, it should be one of the main attractions for children.
There's also a nice sized viewing deck that you can take advantage of that looks over the area. You also be able to view the museum fleet, the cathedral as well as the Kant Island from the deck.
The museum is also home to a sperm whale skeleton and has a series of halls with smaller aquariums and general information about the sea.