British extra-large UUV: Moray
MORAY is a multi-role XLUUV (extra-large unmanned underwater vehicle) designed for both combat and reconnaissance. Its modular design allows for ASW, ASuW, MCM and ISR mission fits... 
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Transatlantic-Narco-submarine-Galicia
Transatlantic NarcoSub cutaway
Low Profile vessel (LPV) was intercepted by the USCG Cutter Valiant in the early hours of 1st September.. and more...
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Delfin
Updated. Originally posted Oct 10 2016.
Mystery of the Cuban Navy's midget sub
Cuba maintains a shroud of secrecy around its sole active submarine, the 20m (65ft) Delfin. Recent satellite imagery shows that she is still active and operates from both her home base at Cabanas and occasionally from the capitol Havana...
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Articles_for_Forbes_2020-02-24
Recent Articles for Forbes
Underwater warfare and similar OSINT / defence analysis topics to a wider audience...
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Myanmar-Navy-Submarine
OSINT confirms Myanmar KILO Class submarine
A set of photos published on Facebook appear to confirm that Myanmar's first submarine, a KILO Class boat, has arrived in the country...
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Russian-Navy-Nuclear-Drone-Submarine
Russian Navy Nuclear-Powered combat AUVs? 
If the robotics revolution pushes us towards uncrewed nuclear subs, will Russia have an advantage?...
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US-Navy-601B-Nuclear-power-pod-for-Submarines
Nuclear power pod concept for submarines (US Navy, 1961)
In the early 1960s General Electric (GE) proposed a podded nuclear power system for submarines and surface ships. These outboard motors were termed it a nuclear power package... 
The REAL Red October - Typhoon SSBN
Updated, originally posted 14th Sept 2014 Not content to rain death and destruction from the skies with his bombers, mankind invented I.C.B.Ms which could be hidden beneath the waves in giant submarines. For a time these sea monsters roamed the world's oceans ensuring an uneasy peace. But mankind was made up of two opposing factions who sought advantage over each other. One was called the Soviet Union and was led by a man named Leonid Brezhnev who learned through his spies that his submarines were not as good as his enemy's. Paranoid and distraught, he sought a way to regain a mad equilibrium. And so he built even bigger sea monsters which could live under the polar ice caps where they were safe from his enemies' hunter-killers. He called these new submarines the TYPHOON 
Seismic_Survey_Sub
Updated with Cutaway. Originally posted May 21 2017
Russian Seismic Survey Submarine for Arctic Operations This is a unique submarine concept developed by the Rubin design bureau. It is designed to conduct sub-bottom surveys using very low frequency active sonar which can penetrate the sea floor...
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Akademik-Aleksandrov
Pr.20183 Akademik Aleksandrov connected to Poseidon/Skif project Sometimes valuable military intelligence is hiding in plain sight. A Russian media report shared to YouTube in June 2019 (now removed) appears to have shown 2М39 Poseidon aboard Akademik Aleksandrov... Read More >....