Concerto for improvised cello in which Rimbaud supplies electronic backing to the sonic wizardry of cellist Kate Shortt. Translated from the German, kernschmelze (meltdown, generally nuclear). However, it can also mean the process or state of irreversible breakdown or decline which, in the context of this recording, Penny Rimbaud sees as the catastrophic social effects of Covid-19 through punitive politicisation.