In Code Name Oath 19, we look at Special Forces diving and more specifically, technical diving as it is known. That is where you must decompress before coming to the surface again, usually, depending on physical fitness, when you are deeper than 130 feet. This is not the same as Special Forces attack diving where rebreathers are used (they don't give out bubbles and can be used for many hours at a time). There, the attack divers are never deep enough to need to decompress. That is the traditional method used when sabotaging something underwater, a Special Forces speciality, a ship or barge (like Angelique did during Code Name Green 41), planting limpet mines and then disappearing again without being noticed. You may also use rebreathers with the typical attack diving method when inserting into hostile coasts. You swim in or sail underwater in an SDV (Special Delivery Vehicle) launched from either a surface warship (described in Code Name Ndebele 14) or a submarine or even by airdrop (described in Code Name Ghost). You cannot go deep with such apparatus, you will die, the air your breath will kill you. In technical dives, you don't even breath normal surface air but exotic gasses, Tri-Mix or whatever works for you and you use special diving suits, special helmets and you don't play the fool. If something goes wrong, you would be lucky to survive. Technical dives are not for all and conducting such dives operationally takes a special breed and specialist training far beyond normal attack diving. The skills are needed, it happens that for operational reasons you must go technical and conduct deep dives, generally to recover something or plant listening bugs on underwater cables. Frequently, the official navy divers are not available or not trained to assist (they do other work, they are not Special Forces rated). It is an interesting subject, we see how it is done in Code Name Oath 19 and how spies do so without anyone on the surface knowing that they are there. They use submarines to get to where they want to be, exit underwater and do what is needed, return safely and no one is any wiser. But when other submarines arrive on the scene and one is inside South African waters where she should not be, things become complicated very quickly. The skippers not about to trust each other nor betray their positions if at all possible. That is what happens in Code Name Oath 19, a Mexican stand-off occurs between the South African SAS Manthatisi, an ultra-quiet German-built Type 209 submarine skippered by an aggressive attack boat commander, Liam Dube, and a French nuclear attack boat. Angelique and Foxtrot are outside, exploring a wreck (a form of technical diving for the insane). Description: Angelique Dawson, South African Secret Service spymaster and her team are after the Werz Papers - a damning report on a Nazi spy ring that operated during World War Two in South Africa. It disappeared mysteriously in the early 1970s. Who else is after the documents and what will happen when the two groups clash as they surely will since peace is not Angelique's occupation? A lot of shenanigans are happening in the background with the narrator, Major Geoffrey Foxtrot, later husband of Angelique Dawson, unable to figure out who is bluffing who. She is playing dangerous games, hell bound to enter the hull of a spy ship sunk in the previous book, Code Name Moonlight. The wreck is resting 300 feet below the Indian Ocean making her exploration inherently dangerous. Angelique is looking for evidence to understand who the spy ship was working for. But that wreck is booby-trapped... and other submarines are sniffing around. It gets complicated very quickly. If you wish to read about Covert and Special Forces Operations in sub-Saharan Africa, the GMJ Books are the place to start. You will learn about covert operations, Special Forces techniques and military history not known outside the select few. Code Name Oath 19 is the 30th book of the popular GMJ Seri