Updated. Originally posted 13th Oct 2018
Yasen Class: Russia's most potent submarines
Project 885 (pr.08850) "Ash" (Ясень) YASEN / GRANEY Class. NATO: SEVERODVINSK Class. The Pr.885 Class nuclear-powered cruise missile submarines (SSGN) represent the most modern and potent Russian submarines are and widely regarded as similar to the latest Western submarines... 
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Sailless_Submarines
Submarines without sails
China has launched an unnamed ‘sailless’ submarine in Shanghai. It is probably the first full-sized sailless submarine, but it the Chinese naval architects behind it are not the first to seriously consider this layout... 
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Narco_2019-03
Updated
Narcosub update
2019 is already looking set to be another bumper year of narcosub incidents, following the three-fold increase witnessed in 2018. A Low Profile vessel (LPV) intercepted by the Colombian Navy in March may represent the first sighting of a new family of nacrosubs...
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Harpsichord_AUV
Updated
Russian Harpsichord (Klavesin) large Unmanned Underwater Vehicles carried by nuclear submarines The Harpsichord-2P-PM (Клавесин-2Р-ПМ) UUV is one of the largest and most advanced UUV programs in Russia. It will be carried by surface vessels or submarines and may become a standard feature of Russian Navy nuclear submarines, giving them an improved Intelligence Surveillance and Reconnaissance (ISR) capability.... 
MURENE_SLV
Updated with additional images: originally posted 6th Sept. 2018
SLV-Murene diver propulsion device The MURENE Subsea Light Vehicle (SLV) is the latest generation of Diver Propulsion Device (DPD) developed by French SDV (Swimmer Deliver Vehicle) manufacturer Alseamar... 
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SeeKrieger
SeeKrieger High Speed Coastal Defense Craft / Submarine
The SeeKrieger is an ambitious submersible boat design from Singaporean based DK Naval Technologies. If the performance matches specifications it will be the fastest naval vessel in the world by a large margin.... 
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WP-18 Tactical Strike Craft
Updated. Originally posted 25th June 2016
With its sleek wave-piercing hull and stealthy lines, the blisteringly quick WP-18 Tactical Strike Craft is the fastest naval vessel in the world. And possibly the most stylish Special Forces boat too. And it is not all good looks! Read More >....
CDV-1_SDV-1_Swimmer-Delivery-Vehicle
Rare piece of SBS and Royal Navy diving history now on display
It was a in many respects ahead of its time, but this advanced Swimmer Delivery Vehicle from the height of the Cold War is virtually unknown.... 
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Pr09852_Belgorod_Launch
Belgorod due for launch The unique Project 09852 Class submarine, Belgorod, is expected to be rolled out of the sheds at Sevmash shipyard in Severodvinsk in just less than two weeks time.... 
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Russian_Tracked_Submarines_Baltic_1980s
Soviet tracked submersibles in Baltic, 1980s 
A spate of submarine incursions in the 1980s led to the suspicion that the Soviet Navy was operating tracked submersibles in Swedish waters.... 