D/E subs are very good and very quiet, virtually undetectable once submerged. The reason the US doesn’t use them is range. The US is a blue water navy. But for countries that only operate in coastal brown water, D/E makes the most sense.
57 posted on 05/14/2019 7:17:32 AM PDT by Magnum44
(My comprehensive terrorism plan: Hunt them down and kill them)