Danger of circular references in OSINT 
Official commemorative pendants depicting Russian spy submarines are a goldmine for Open Source Intelligence (OSINT). The aim of Open Source Intelligence (OSINT) is to gain insights into the activities, capabilities and intentions of {insert government or non-state organization} using publicly available information. So in the case of the secretive world of Russian submarine programs this includes trawling through documents and web chatter related to the shipyards and design bureaus associated with them. Often pendants, posters and medals reveal or confirm some small details about the submarines in question.
However, things are not always what they seem.... Read More >....
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Pr885_Analysis
Originaly posted 17th April 2017
Analysis of Project 885M Yasen-M Submarine images After the first improved project-885M Yasen-M submarine, K-561 Kazan, was launched at the Sevmash yard on 31st March 2017, images are slowly leaking out of Russia.
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Narco-VSV
First two Very Slender Vessel (VSV) narco-subs seized
On Saturday 22nd April 2017 anti-narcotics agents from the Guatemalan National Civil Police seized an abandoned narco-sub in the Pacific. A second example was intercepted by USCGC Waesche (WMSL-751) on 8th June. One is interesting, two is a trend.....
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Ortega_SDV
Updated text on Mk.1D 9th June 2018
Latest Dutch Special Forces Swimmer Delivery Vehicles
Dutch Swimmer Delivery Vehicles built by Ortega are based on the original World War Two ‘Sleeping Beauty’. That was a small single-person boat designed to run for long distances on the surface, only submerging when it approached the target area. Despite the unambiguous influence, the Ortega designs add modern hydrodynamics and the latest technology to create a cutting-edge Special Forces vehicle.. Read More >....
Chariot_Mk2
The forgotten British SDV: Chariot Mk.II 
The Chariot Mk.II is a forgotten hero of World War Two British midget submarines. It was kept secret and remained in service after the war...
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History of Israeli Subs
The submarine force of the Israeli Navy is unlike any other submarine force in existence. As a small country surrounded by enemies, Israel has driven itself to the forefront of military technology and application. The history of the Israeli Navy's 7th Flotilla s particularly interesting. Today Israeli submarines are among the most sophisticated and potent boats in service with any navy.
SWCS
Shallow Water Combat Submersible (SWCS) - US Navy's and USSOCOM's next generation SEAL Delivery Vehicle. Read More >....
Triton-1
Triton-1: Spetsnaz’s unknown Swimmer Delivery Vehicle (SDV) The offensive potential of the Triton-1 was put to the test in October 1961 when an ace crew conducted a demonstration sneak attack at Tallinn in Estonia, then part of Soviet territory. The crew passed through the harbor defenses unobserved and surfaced within 30m (30 yards) of a submarine tied up at the pier. Still undetected, they sank from sight and made the return journey, again passing through the boom defenses unnoticed. It was a powerful demonstration to the Soviet Navy and ensured the future of the frogmen and their craft..... Read More >....
Porpoise_1000
Porpoise 1,000-ton littoral submarine concept 
Small submarines pose an elusive threat to naval forces operating in relatively shallow waters, particularly amidst islands. Knowing this the Swedish Navy has a long tradition of building relatively small submarines optimized for the confined waters of the Baltic and particularly among the thousands of islands in the Swedish Archipelago. The Porpoise 1000 ton concept is a Swedish submarine officer’s take on the ideal littoral submarine...
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RuPAC_rescueX
Russian Pacific Fleet shows submarine rescue capability The Russian Ministry of Defense has shared photos from a recent exercise in Pacific. They show the a Project 18270 BESTER DSRV deploying from the rescue ship Igor Belousov. Also shown is a British-built Saab SeaEye Tiger ROV...
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