Certain vessels acquire a mystique that sets them apart from others. CSS Acadia, the Maritime Museum of the Atlantic’s Canadian Scientific Ship, is one such vessel. On Tuesday, July 8, at 1 p.m., museum staff and former Acadia crew members will gather to celebrate the 95th anniversary of the ship. Launched in 1913 at Newcastle upon Tyne, England, Acadia was the first vessel specifically designed to survey Canada’s northern waters. During a career that spanned 56 years, Acadia pioneered hydrographic research. It is the only surviving ship to have served the Royal Canadian Navy during both world wars. It is also the only vessel still afloat that survived the Halifax Explosion. Admission to the ship will be free throughout the day and anniversary cake will be served between 2 and 2:30 p.m. Acadia is docked behind the Maritime Museum of the Atlantic, 1675 Lower Water St., Halifax.