Reported top speed. And it was seen as shocking enough to spur the investment into new torpedo technology.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Alfa-class_submarine#Impact" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Alfa-class_submarine#Impact</a><p>Like most fears over high-performance Soviet hardware though, the threat turned out to be overblown compared to the actual numbers build &#x2F; operational state.