Relevant news:
<a href="http:&#x2F;&#x2F;www.bbc.com&#x2F;news&#x2F;world-europe-34797252" rel="nofollow">http:&#x2F;&#x2F;www.bbc.com&#x2F;news&#x2F;world-europe-34797252</a>
Seems that Russians are already working on new generation torpedo. It seems it would be aimed more at oil and gas pipelines than internet cables, but who knows...