When a submarine surfaces through a couple of metres of ice, the cracking noise is significant and can certainly be heard by other people’s navies, using distant microphones.
It also risks tearing off external components such as hydroplanes and periscopes.
Today’s invention is for the submarine to extend a heat exchanger, connected using insulated pipes, to its engine towards the undersurface of the ice.
This allows for quiet and quite rapid melting, before the sub extents its periscope, checks the territory and comes to the surface through a pool of slush.
