OSINT Landscape released
This landscape shows the main platforms and tools of Open Source Intelligence (OSINT) and Open Source Investigation (OSINV). OSINT is the collection and analysis of publicly available sources in an intelligence context. "Open" refers to overt, publicly available sources as opposed to covert or clandestine sources..... Read More >....
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SIERRA-II
Russian SIERRA-II attack submarine ('Condor')
Two titanium-hulled SIERRA-II nuclear powered attack submarines serve with Russia’s Northern Fleet stationed near the Arctic Circle.... 
Single-versus-Double_Hull
Single & Double-hulled submarines demystified
Submarines can be divided into those with a Single Hulls and those with Double Hulls. The former has only one layer of steel between the crew and the open ocean while the latter has an external outer hull which completely encases the occupied inner hull. The relative merits of these two approaches is hotly debated....
USN-SEALs_Jetski
US Navy SEALs' modified jetski revealed
A photo published by the US Navy shows the heavily modified YAMAHA 2016 FX CRUISER SHO jetski... 
Vogo_SDV-1000W
Vogo Engineering's SDV-1000W Submersible boat / Swimmer Delivery Vehicle... 
Dutch_WW2_Subs
Advanced Dutch multi-hull submarine designs of World War Two 
At the start of World war Two, naval architects from the Dutch B.V. Nederlandsche Ver. Scheepsbouw Bureaux took refuge in the United Kingdom, where they continued to design submarines.. Read More >....
Newsflash-KANYON
Newsflash: KANYON
An unclassified Nuclear Posture Review document revealed by the Huffington Post contains a tiny reference which confirms the seriousness given to the KANYON nuclear-armed nuclear-powered torpedo.
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Iran_Chariot
Iranian e-Ghavasi Human Torpedo 
This enigmatic ‘Swimmer Delivery Vehicle’ developed by Iran takes the term ‘human torpedo’ to the extreme; it is based on a 533mm (21”) heavyweight torpedo with the pilot laying prone in the nose.... Read More >....
Yugo_X-Craft
Yugoslavian X-Craft: R-3E
Yugoslavia gained a reputation for special forces crat, chief among which was the R-3E X-craft. Developed in the Cold War it was in many respects ahead of its time as a dry-SDV....
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Time_Lapse
Time lapse video of Submarine Cutaway in MS Paint
View it on Youtube: