Ivan Grigoryevich Bubnov was a Russian

Russians

The Russian people are an East Slavic ethnic group native to Russia, speaking the Russian language and primarily living in Russia and neighboring countries....

 marine engineer and designer of submarine

Submarine

A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

s for the Imperial Russian Navy

Imperial Russian Navy

The Imperial Russian Navy refers to the Tsarist fleets prior to the February Revolution.-First Romanovs:Under Tsar Mikhail Feodorovich, construction of the first three-masted ship, actually built within Russia, was completed in 1636. It was built in Balakhna by Danish shipbuilders from Holstein...

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Bubnov was born in Nizhny Novgorod

Nizhny Novgorod

Nizhny Novgorod , colloquially shortened to Nizhny, is, with the population of 1,250,615, the fifth largest city in Russia, ranking after Moscow, St. Petersburg, Novosibirsk, and Yekaterinburg...

 and graduated from the Marine Engineering College in Kronstadt

Kronstadt

Kronstadt , also spelled Kronshtadt, Cronstadt |crown]]" and Stadt for "city"); is a municipal town in Kronshtadtsky District of the federal city of St. Petersburg, Russia, located on Kotlin Island, west of Saint Petersburg proper near the head of the Gulf of Finland. Population: It is also...

 in 1891. He graduated from the Nikolayev Marine Academy in 1896. He initially joined the Admiralty Shipyard

Admiralty Shipyard

The Admiralty Shipyard is one of the oldest and largest shipyards in Russia, located in Saint Petersburg. The shipyard's building ways can accommodate ships of up to , 250 meters in length and 35 meters in width...

 in Saint Petersburg and worked as a constructor on the Battleship Poltava

Japanese battleship Tango

The Russian battleship Poltava was a Petropavlovsk-class battleship of the Imperial Russian Navy. She was one of eight Russian pre-dreadnought battleships captured by the Imperial Japanese Navy during the Russo-Japanese War of 1904–1905. Poltava was built at the Galernii Island shipyard, one of a...

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In 1900, he was appointed Chief Assistant at the Russian Admiralty test tank

Ship model basin

A ship model basin may be defined as one of two separate yet related entities, namely:* a physical basin or tank used to carry out hydrodynamic tests with ship models, for the purpose of designing a new ship, or refining the design of a ship to improve the ship's performance at sea;* the...

 and was involved in the design of the first Russian submarine, the Delfin

Russian submarine Delfin

Delfin was the first Russian battle submarine.She was designed by Naval architect Senior Assistant I.G. Bubnov, Lieutenant M.N. Beklemishev and Lieutenant I.S. Goryunov of the Construction Commission for Submarines , laid down by Baltic plant at St...

. In 1903, he became the Russian Admiralty's submarine designer and was responsible for the following submarine classes:

• Kasatka
  Kasatka class submarine
  The Kasatka class were a group of submarines built for the Imperial Russian Navy. The six boats were built between 1904 and 1905. They were designed by I.G. Bubnov and were based on the Delfin. The first boat Kasatka experienced significant problems with stability on trials and had to have extra...
  
  
• Minoga
  Russian submarine Minoga
  The Minoga was a submarine built for the Imperial Russian Navy. She was built by Baltic Yard in St Petersburg and designed by I.G. Bubnov. She was a single hulled boat with a 16 fathom diving depth. While an advance on previous boats the single shaft design was not very manueverable and the...
  
  
• Akula
  Russian submarine Akula (1908)
  Akula was a submarine built for the Imperial Russian Navy. The boat was designed by Ivan Bubnov and was an amalgam of the previous Minoga and the Kasatka class submarine designs. The design was presented to the Marine technical committee in late 1905. Initially the boat was to use petrol engines...
  
  
• Morzh
  Morzh class submarine
  The Morzh class submarines were built for the Black Sea Fleet of the Imperial Russian Navy shortly before World War I.-Background:The class was constructed as part of an ambitious programme of naval construction devised by the Naval General Staff in 1909. This envisaged, among other things, the...
  
  
• Bars
  Bars class submarine (1915)
  The Bars class were a group of submarines built for the Imperial Russian Navy during World War I. A total of 24 boats were built between 1914 and 1917-Design:...
  
  

In 1904, Bubnov became a lecturer at the Saint Petersburg Polytechnical University

Saint Petersburg Polytechnical University

Saint Petersburg State Polytechnical University is a major Russian technical university situated in Saint Petersburg. Previously it was known as the Peter the Great Polytechnical Institute and Kalinin Polytechnical Institute .-Imperial Russia:...

. He was commissioned into the Navy in 1907 and was head of the Admiralty test tank between 1908 and 1914.

Bubnov was promoted to Major General of the Corps of Naval Constructors in 1912. Between 1912 and 1917, he was a consultant to the Baltic Works in Saint Petersburg and Noblesser in Reval.

Bubnov died of typhoid in Petrograd in 1919.