The submarine B-413, project 641, is moored at the quay of World Ocean Museum. The visitors can have a tour of all its compartments - leaving and military.

The project 641 submarines are diesel submarines. The uniqueness of the submarine is that it was preserved in its normal operational condition. 

The length of the submarine is 91 m, the width of the submarine is 8.5 m. It is divided into several compartments: nose and stern torpedo compartments, diesel engine compartment, electric engine compartment, battery compartment, control room, sonar room, crew compartments, captain and officers` cabins, petty officers` mess and galley. By a small ladder one can climb in the upper compartment and view the environs through periscope.