Every missile is a carefully packaged bad day traveling at high speeds. Hypersonic missiles are a modern development in the long-running military arms race to figure out just how certain that bad end is for the humans on the receiving end. Russia's Zircon missile could enter arsenals as early as 2018. Despite headlines to the contrary, not enough about the missile is known yet to definitely claim that it poses an uncounterable threats ships in the sea.
In Tom Clancy's book (and, later, the 1990 film) The Hunt For Red October, a Soviet submarine debuts a revolutionary, ultra-quiet engine that uses pumpjets and electrical propulsion technology to elude its foes. Chinese state media has reported that the nation is fitting its newest nuclear sub with an engine that sounds a lot like Clancy's imaginings in the real world.