The Museum of Underwater Activities Piran was founded by the Maritime Heritage Preservation Institute in 2006. Its rich collection is focused on the historical technical equipment such as diving apparatuses, diving suits and helmets as well as military uniforms ans insignias. As the technical innovation, development and training of underwater diving derived mostly from the military activities, the museum's artefacts and archives cover all the navies that were active at the Adriatic Sea from 1909 to the present day. Another important feature is the local history of professional diving. This attractive private museum is located at the Piran old harbor close to the Sergej Mašera Maritime Museum.
In 2017 the museum published a richly illustrated book on diving helmets in Slovenia.