Katsonis-class submarine

The Katsonis class was a French-built class of two submarines for the Hellenic Navy, serving from 1927–28 until the Second World War. The ships of the class were the first new submarines acquired by Greece after the First World War.

Appearance and characteristics
In general, they were similar to the French Navy's Circé class submarines, but the conning tower was larger in order to accommodate the rotating platform of the 100 mm gun.

Ships
Two ships were built:
 * Katsonis (Y-1), commissioned on 8 June 1928, it was sunk by a German submarine chaser on 14 September 1943
 * Papanikolis (Y-2), commissioned on 21 December 1927, it served throughout World War II until scrapped in 1945. Only its conning tower has been preserved, and is exhibited at the Hellenic Maritime Museum.