Green Flash wrote;
I think their Kilo's might be a bit long in the tooth, do they have other types?
If the Kilos have been well-maintained then they remain a threat (but i doubt as far as the Western Approaches without support). The Kilos are probably the most successful conventional submarine design (along with the former RN
Upholder class that the The Iron Lady's lot stupidly sold to the Canadians).
The Kilos prime advantage is that below a certain speed they are incredibly quiet and difficult to track, particularly if they use water layers to avoid detection.