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NR-1
The US Navy's nuclear powered midget submarine: NR-1 
At barely 40 meters (130ft) the NR-1 (Navy Reactors-1) was a midget submarine by US Navy standards. It was by far the smallest nuclear powered submarine in the world when she was launched on 25th January 1969. A special mission spy submarine, she was built under the guise of research, oceanography and later deep sea rescue in great secrecy in the same shed where the first nuclear submarine, USS Nautilus, had been.
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Evolution of Polish Blotniak SDV
The Polish Blotniak is the only single seat enclosed SDV (Swimmer Delivery Vehicle) ever seriously developed. 
Originally posted 22nd Oct 2014
CIA_Water-Air_1958
Overview of CIA Water-Air Division equipment, 1958 This is a summary and analysis of a CIA booklet from 1958 (now declassified with redaction) covering ”Equipment and/or Test Reports Available for Operational use or Planning”. It was compiled by the CIA Water-Air Division who were the Cold War evolution of the Wartime OSS Maritime Unit. Read More >....
Spy Subs - X-RAY
Russian X-RAY Class Special Mission submarine 
The Russian Project 1851 Nelma class (NATO: X-RAY class) midget submarine is shrouded in secrecy. Read More >....
Swedish_Sub_Incursions_RYAN
Swedish news article on Cold War imcursions 
This morning’s Blekinge Lans Tidning (BLT) newspaper ran a story on the Swedish Cold War submarine Incursions. Retired Naval Officer Nils-Ove Jansson drew parallels to when Soviet Spetsnaz combat swimmers came ashore in Sweden to reconnoiter the placing of nuclear mines (allegedly). An interesting article in a few ways... Read More >....
Unbuilt_Russian_Spy_Subs
Multifunctional underwater station (MPS) In 2010 the Russian Ministry of Industry and Trade patented a ‘Multifunctional underwater station (MPS) (Russian: Многофункциональная подводная станция (МПС). Two years later Russian submarine design bureau Lazurite proposed the same design for a range of underwater engineering tasks. Although presented as a civilian platform the design gives us good insight into the Russian ‘deep station’ spy submarines operated by GUGI (Main Directorate of Deep-Sea Research, Military Unit 40056)... Read More >....
DGSE_SDVs
French Secret Intelligence Agency's unknown minisubs 
The World’s national intelligence agencies rarely reveal their submarines. France’s DGSE (Direction générale de la sécurité extérieure - English: General Directorate for External Security), equivalent of the CIA and MI6, is unusual in having its own pool of combat swimmers (Nageur de combat). As well as having access to French Special Forces’ Swimmer Delivery Vehicles (SDVs) they have been equipped with their own unique lineage of SDVs.
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South African Riverine Assault Boat
Originally posted 5th September 2016
Images have emerged of the new South African riverine assault boat in service. Two boats were acquired under Project Carol, joining the SA Navy MRS Operational Boat Division... Read More >....
Explosive_boats
A brief history of Explosive Boats 
The recent attack on a Saudi frigate off Yemen by Houti rebels using a remote controlled explosive boat brings these craft into focus. There have been a lot of different explosive boats developed over the years although few are well known. They are not only used by non-State actors and their history is actually closely intertwined with the minisubs used by Naval Special Forces... Read More >....