Titanic Historical Society of the disaster in Boston, Massachusetts. The event brought together several living survivors, including Eva Hart, Louise Pope, Michel Marcel Navratil, and Beatrice Sandstrom, who enthralled those in attendance with their vivid first-person accounts of the night the "Titanic" foundered in the north Atlantic Ocean. Walter Lord, author of his seminal "Titanic" work, "A Night to Remember", was another featured guest. The Society also works to preserve the history of other ocean liners, especially the "Titanic" 's sister ship, the White Star Line's HMHS "Brittanic", which sank after hitting an enemy mine in World War I, and the Cunard ship
Sister ship an . The most famous sister ships were the White Star Line's , and . As with some other liners, the sisters worked as running mates. Other sister ships include the Royal Caribbean International's and . "Half-sister" refers to a ship of the same class but with some significant differences. One example of half-sisters are the First World War-era British s where the first two ships had four guns, but the last ship, , had two guns instead. Another example is the American s of the Second World War that came in "long-hull" and "short-hull" versions. Notable airships include the