As hinted at in the "rubbergas" post, the Saudis are generally ranting about Indian saboteurs but may not be particularly clear on how the sabotage was committed. The dead guy they have is probably not in his wet-gear anymore, as this would obscure his identity from the press.
Meanwhile, the official Indian position is going to be along the lines of, "Amiir al-Bihar has been destroyed but we can not comment on the specifics of the mission due to operational security requirements."
I think a country with past experience in similar ops, a country allied to India, or a country which has enough evidence (the UK, in this case, has three clues) could put the story together; others might get there through guesswork. Question is - will they take it as a serious threat, or say, "Yeah - but it was a thirty year-old peice of crap in a Saudi backwater port. That couldn't happen to my shiny new 40,000 t battleship!"