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 ?