Astute's successor: SSN(R)
Royal Navy planners are already looking to the next class of British attack submarines. Although there is little-to-nothing on this subject on the internet, it is a good time to start an article... 
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Surcouf, The Ultimate Interwar Cruiser Submarine
Surcouf
The French cruiser submarine Surcouf was without parallel in the World, and remained the largest and most heavily armed until the final years of World War Two... 
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Narco_2018-12
New development in Narcosub VSVs
Recording of recent narco-sub incidents....
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Turbinia
Turbinia: fastest boat in the world (1896) When it was perfected in 1896, it was literally twice as fast as anything in service with Navies. The world of naval combat was changed forever.... 
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Sarov_Submarine_update
OSINT: Russia's Sarov Class special test submarine in shed
Sometimes it is what is missing rather than what is present that is interesting in a satellite image... 
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Nautilus-2020_Luxury_Submarine
Nautilus-2020 Private Private Submarine
What better way to blow the Monaco Yacht show out of the water than with your own private luxury submarine?
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Attack_Class_Submarine
Attack Class submarine
The Attack Class diesel-electric submarine will replace the Collins Class in service with the Australian Navy with the first boat, HMAS Attack, to be delivered in the 2030s....
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China_Stretched_KILO
Debunked: Chinese Navy stretched KILO Class submarine
In September a new modified KILO Class submarine was seemingly observed during a Chinese training Exercise. The modified KILO is now confirmed as fake....
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SwarmDiver
SwarmDiver unmanned surface vessel
Massachusetts based robotics company Aqua Botix have unveiled a new military family of micro-Unmanned surface Vessels.... Read More >....
WTD-71 SDV
SDV projects from WTD-71 Aquatechnik
Two-man SDV (Swimmer Delivery Vehicle) built and tested by Wehrtechnische Dienststelle WTD-71 (Technical Center for Ships and Naval Weapons, Marine Technology and Research) in Eckernforde.... Read More >....