Wish I could say I was surprised by this, but I'm not. The Cape Of Good Hope, like Cape Horn, is absolutely notorious for some of the most savage weather conditions anywhere short of the North Sea. The proof lies in the broken fragments of ships which have been littering the coastlines for centuries.
Somehow, I doubt the M/V Sea was in very good shape after languishing in prolonged layup either and the sheer age of the hull couldn't have been very helpful.
Actually, I'm rather glad to see it happen. To be swallowed by the sea is much more favorable end
(IMHO) than the scrappers torch. I find it gratifying when a ship founders en route to the scrapyard, almost symbolic.
To see a ship being scrapped is just as sad as seeing a loyal pet put down. It's a tragedy