Great sea power? Like Brits traveled from far away and kicked their butt in Crimean War? And then Japanese kicked their butt in 1905? And thanks to this butt kicking we had Japan join Hitler in WW2, otherwise the Japanese imperialists would not have had the confidence to do this.
During the border war, our strike craft and submarines were operating virtually with impunity off the Angolan coast, despite the almost constant presence of Russian/USSR warships, torpedo boats and submarines in the Angolan waters and harbours.
The Russians just couldn't fathom that we could be so cheeky and how they couldn't catch or spot us, so they came up with all kinds of wild conspiracy theories. One of them was that we were using Japanese fishing trawlers to insert our "commandos" into Angola, which was of course complete bollocks.
I think the Japanese trawler captains must have wondered why they were so frequently stopped and searched and otherwise rudely treated in Angolan waters.
At one point, Ystervuis divers also had a unique opportunity to blow a Russian kilo class submarine out of the water in an Angolan port whilst giving UNITA the credit.
Unfortunately the sub was only spotted whilst the divers were swimming right past it on their way to a different target. The divers did surface and discuss the potential of re-targeting, but just changing the mission parameters and making a spur of the moment decision in such a high stress situation that could potentially draw SA into a direct conflict with the USSR was a bit too much for the commander, so the opportunity was passed off.