Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Krab (Краб - Crab) was a submarine built for the Imperial Russian Navy. She was designed by Mikhail Petrovich Nalyotov as the world's first submarine minelayer, although due to construction delays the German UC submarines entered service earlier. The mines were stowed in two horizontal galleries exiting through the stern. Diving depth was 45 metres. This ship was built by the Naval yard in Nikolayev by the Black Sea (now Mykolaiv, Ukraine). She was ordered in 1908, launched in September 1912 and entered service in 1915. This submarine fought during World War I in the Black Sea Fleet. She laid several minefields which accounted for the Turkish gunboat Isa Reis and the Bulgarian torpedo boat Shumni as well as several merchant ships.