"Mermaid" - the battleship of the coastal defense of the Russian imperial fleet, which sank on September 7, 1893 off the coast of Finland. The tower armored boat "Mermaid" was laid down in 1866 on Galerny Island in St. Petersburg. Launching took place on August 31, 1867. As part of the fleet since 1868, assigned to the armored squadron of the Baltic Fleet. In the summer campaign of 1869, S.O. Makarov served on the Mermaid. At the end of the campaign, the first accident occurred on the boat, which almost ended in the death of the ship. Following in skerries, the Mermaid touched the starboard side of the underwater stone. On February 1, 1892, the Mermaid armored boat was transferred to the category of coastal defense battleships. It was part of the training and artillery detachment of the Baltic Fleet. On October 11, 1893, by the Highest Order, the coastal defense battleship Mermaid was excluded from the lists of ships of the Russian Imperial Navy.