Years ago (70's or 80's) I read a sci-fi novel. Novel started with the discovery in the arctic (or antarctic) of a pair of humans (male and female) frozen in a block of solid helium. When thawed out, they revive and tell a story of an ancient high-technology civilization (back when Gondwanaland existed I seem to recall). This civilization had access to incredible energy sources having developed a grand unified theory of everything. In the end, they destroyed themselves in a conflict so huge that it shifted the earth on it's axis. Anyone know what the novel was ?