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.... 
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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:
Undersea_Cables
Updated: DG-450 and DG-350 added. Originally posted 10th June 2017.
Russian capabilities against undersea cables
A recently published article by British Member of Parliament Rishi Sunak shows the growing awareness of a new fundamental weakness of NATO countries (and many other countries around the world). The concern is that an adversary could gain a strategic advantage by interrupting internet and telecommunications between countries at a critical moment by attacking the numerous Submarine Communications Cables (SCC) which litter the sea floor between countries. The ground truth of this new naval arena clearly favors Russia both in terms of naval investment and the circumstances of geography.
This article summarizes my own thoughts and analysis on the topic.
Corrections and comments welcome.
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ARA_San_Juan
Appeal
The sense of loss when a submarine is lost during peace time transcends national boundaries and politics. Submariners have a sense of community so it is no surprise that, absent any suitable charity appeals already being established by others, a former submariner has taken it upon himself to organize one. Details yet to be published.
Watch Twitter or Reddit for details on how to donate.
I have agreed to donate signed copies of WORLD SUBMARINES: Covert Shores Recognition Guide for larger donations – see above links for details of this and other offers.... Read More >....